Museum officials say the Smithsonian’s National Air and Space Museum has reopened after being evacuated.
First responders, explosive disposal specialists and hazardous material experts have closed the Marine Corps Base Quantico post office until further notice.
Streets in front of the District Court in Rockville are closed while police investigate the report of a suspicious package.
Traffic is again flowing along Maple Avenue (Route 123) in Vienna, Va. after the roadway was closed for hours as police investigated a potentially explosive device.
U.S. Park Police temporarily shut down one of the busiest metro stations, but have since re-opened it after discovering the contents of a suspicious package.