US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves At Least One Wounded

Police and firefighters respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

A helicopter lifts a person off the roof as police respond to the report of a shooting at the Navy Yard in Washington, Dc on September 16, 2013. Departures have been halted at Washington's Reagan National Airport due to a shooting at the US Navy Yard, an official said Monday. Chris Paolino, a spokesman for the airport, said inbound aircraft are still landing and that the airport remains open to passengers. "We can confirm that the FAA (Federal Aviation Administration) has halted aircraft departures from Reagan National due to an active law enforcement incident at the Washington Navy Yard," Paolino told AFP via email. Several people have been wounded in the shooting at the nearby US Navy Yard in Washington, authorities said. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police and firefighters respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves At Least One Wounded

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police and firefighters respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

A helicopter lifts a person off the roof as police respond to the report of a shooting at the Navy Yard in Washington, Dc on September 16, 2013. Departures have been halted at Washington's Reagan National Airport due to a shooting at the US Navy Yard, an official said Monday. Chris Paolino, a spokesman for the airport, said inbound aircraft are still landing and that the airport remains open to passengers. "We can confirm that the FAA (Federal Aviation Administration) has halted aircraft departures from Reagan National due to an active law enforcement incident at the Washington Navy Yard," Paolino told AFP via email. Several people have been wounded in the shooting at the nearby US Navy Yard in Washington, authorities said. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said."There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

(credit: Alex Wong/Getty Images)

A law enforcement officer aims his rifle to a building as he responds to a reported shooting at an entrance to the Washington Navy Yard on Sept. 16, 2013 in Washington, D.C. (credit: Alex Wong/Getty Images)

US-MILITARY-SHOOTING

A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter patrols over the US Navy Yard September 16, 2013 in Washington,DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

US-MILITARY-SHOOTING

A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. An unidentified gunman opened fire at the US Navy Yard in Washington on Monday and wounded several people including two police officers, officials reported. Police and FBI agents descended on the area in force as helicopters buzzed overhead, amid reports the shooter was armed with an assault rifle and was on the loose in the complex. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, the Washington Post and other media reported. At one point a police helicopter hovering over the complex lowered a man down by rope into the compound. Police blocked off intersections around the Navy Yard as military troops in uniform stood guard at street corners. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Police walk on a residential street near the Washington Navy Yard on September 16, 2013 in Washington, DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point." AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

People come out from a bulding with their hands up after a shooting happened at the Washington Navy Yard September 16, 2013 in Washington, DC. Police believe there to be as many as two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

A police helicopter circles around above the Washington Navy Yard after a shooting rampage happened September 16, 2013 in Washington, DC. Police believe there to be as many as two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

A police officer inspects vehicles with his canine at a parking lot outside the Washington Navy Yard as he responds to a shooting September 16, 2013 in Washington, DC. Police believe there to be two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

US-MILITARY-SHOOTING

An armoured personnel carrier speeds down M Street, SE away from the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported.AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

A heavy armed police officer patrols a parking lot outside the Washington Navy Yard as he responds to a shooting September 16, 2013 in Washington, DC. Police believe there to be two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

US-MILITARY-SHOOTING

Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported.AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter patrols over the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

US-MILITARY-SHOOTING

(Photo by MANDEL NGAN/AFP/Getty Images)

A woman talks on the phone after she walked out of a building on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Shooting eyewitness Patricia Ward speaks to the media on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported.AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

A general view shows first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

Heavyly armed police officers respond to a shooting at the Washington Navy Yard September 16, 2013 in Washington, DC. Police believe there to be two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

US-MILITARY-SHOOTING

A DC Police patrol boat speeds down the Anocostia River next to the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

US-MILITARY-SHOOTING

People exit a building with their hands above their heads as police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

People come out from a bulding with their hands up after a shooting happened at the Washington Navy Yard September 16, 2013 in Washington, DC. Police believe there to be as many as two shooters who killed several people and wounded others in an incident that put parts of the city on lockdown. (Photo by Alex Wong/Getty Images)

US-MILITARY-SHOOTING

District of Columbia Police Chief Cathy Lanier (R) walks away from a press conference on the Navy Yard shooting on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point." AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

District of Columbia Police Chief Cathy Lanier (C) walks away from a press conference on the Navy Yard shooting on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point." AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

District of Columbia Mayor Vincent Gray (3rd R) walks away from a press conference on the Navy Yard shooting on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

District of Columbia Mayor Vincent Gray speaks during a press conference on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Obama Speaks On 5-Year Anniversary Of Financial Crisis

U.S. President Barack Obama walks up to speak about the shooting at the Navy Yard, this morning before talking about progress in the economy since the financial crises that happened five years ago, in the Rose Garden at the White House September 16, 2013 in Washington, DC. The worst financial crisis since the great depression began five years ago this month with the collapse of Lehman Bros., massive home foreclosures, bank failures, massive layoffs and diving stock prices. (Photo by Mark Wilson/Getty Images)

Obama Speaks On 5-Year Anniversary Of Financial Crisis

U.S. President Barack Obama speaks about the shooting at the Navy Yard, this morning before talking about progress in the economy since the financial crises that happened five years ago, in the Rose Garden at the White House September 16, 2013 in Washington, DC. The worst financial crisis since the great depression began five years ago this month with the collapse of Lehman Bros., massive home foreclosures, bank failures, massive layoffs and diving stock prices. (Photo by Mark Wilson/Getty Images)

US-MILITARY-SHOOTING

A member of the US military leaves the area following a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. "At this hour, it appears that we have at least 12 fatalities," Washington DC police chief Cathy Lanier told a press conference. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter lifts off from the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter flies over the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter flies over the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

A US Park Police helicopter lifts off from the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit : MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

Media and emergency response personnel gather outside the US Navy Yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

Media reporters gather outside the US Navy Yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

Media reporters gather outside the US Navy Yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

Media reporters gather outside the US Navy Yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

(Photo credit: MLADEN ANTONOV/AFP/Getty Images)

A US Park Police helicopter flies over the US Navy Yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing "multiple" victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. "We believe there were multiple deaths," a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

Unidentified people are seen on September 16, 2013, outside parking lot B of Nationals Park which has been set as a gathering point for families of the Navy Yard shootings in Washington DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point. (Photo credit: MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Unidentified people are seen on September 16, 2013, outside parking lot B of Nationals Park which has been set as a gathering point for families of the Navy Yard shootings in Washington DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point. (Photo credit: MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Unidentified people are seen on September 16, 2013, outside parking lot B of Nationals Park which has been set as a gathering point for families of the Navy Yard shootings in Washington DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left "multiple victims" dead, the city's police chief said. "We have one shooter that we believe involved in this that is deceased," said Washington police chief Cathy Lanier. "The big concern for us right now is that we potentially have two other shooters that we have not located at this point." (Photo credit: MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, D.C., on Sept. 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Members of the military look out from a nearby building toward police units responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

Police units walk on a rooftop as they respond to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: SAUL LOEB/AFP/Getty Images)

US-MILITARY-SHOOTING

An unidentified woman is reunited at the family gathering site outside parking lot B of Nationals Park, which has been set as a gathering point for families of the Navy Yard shootings in Washington DC on September 16, 2013. The shooting rampage at a Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: MANDEL NGAN/AFP/Getty Images)

US-MILITARY-SHOOTING

An unidentified woman is reunited at the family gathering site outside parking lot B of Nationals Park, which has been set as a gathering point for families of the Navy Yard shootings in Washington DC on September 16, 2013. The shooting rampage at a Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. "We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured," she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. (Photo credit: MANDEL NGAN/AFP/Getty Images)

Security Tightens At US Capitol After Deadly Shootings At Washington Navy Yard

WASHINGTON, DC - SEPTEMBER 16: A U.S. Capitol Police officer stands guard in front of the U.S. Capitol, September 16, 2013 in Washington, DC. Security around the U.S. Capitol building has been tightened due to today's mass shooting at the Washington Navy Yard where atleast 12 people were shot and killed by a gunman. (Photo by Mark Wilson/Getty Images)

Security Tightens At US Capitol After Deadly Shootings At Washington Navy Yard

WASHINGTON, DC - SEPTEMBER 16: A U.S. Capitol Police officer stands guard in front of the U.S. Capitol, September 16, 2013 in Washington, DC. Security around the U.S. Capitol building has been tightened due to today's mass shooting at the Washington Navy Yard where atleast 12 people were shot and killed by a gunman. (Photo by Mark Wilson/Getty Images)

Security Tightens At US Capitol After Deadly Shootings At Washington Navy Yard

WASHINGTON, DC - SEPTEMBER 16: A U.S. Capitol Police officer stands guard in front of the U.S. Capitol, September 16, 2013 in Washington, DC. Security around the U.S. Capitol building has been tightened due to today's mass shooting the Washington Navy Yard where 12 people were shot and killed by a gunman. (Photo by Mark Wilson/Getty Images)

US-MILITARY-SHOOTING

A police officer patrols outside the US Navy Yard September 16, 2013 in Washington, DC. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. "At this hour, it appears that we have at least 12 fatalities," Washington DC police chief Cathy Lanier told a press conference. (Photo credit: MLADEN ANTONOV/AFP/Getty Images)

US-MILITARY-SHOOTING

A member of the US Navy leaves the area following a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. "At this hour, it appears that we have at least 12 fatalities," Washington DC police chief Cathy Lanier told a press conference. (Photo credit: SAUL LOEB/AFP/Getty Images)

Navy Yard victim 1

Karin Johnson shows a photo of her father John “JJ” Johnson and her mother, Judy. John was one of the victims of Monday’s Navy Yard shootings in D.C. (Photo by Mark Segraves/All News 99.1)