WASHINGTON (CBSDC/AP) — The director of the Central Intelligence Agency is warning that the Islamic State of Iraq and Syria could have more attacks “in the pipeline.”

Speaking at the Center for Strategic & International Studies’ Global Security Forum, John Brennan believes the terror group is planning more horrific attacks like the one seen in Paris on Friday.

“I would anticipate that this is not the only operation that ISIL has in the pipeline,” Brennan said, according to CBS News.

He continued, “It’s not a surprise this attack was carried out from the standpoint we did have strategic warning. We knew that these plans, the plotting by ISIL, was underway.”

Brennan said European nations are “under strain” dealing with monitoring the influx of refugees from the Middle East and also alluded to problems with the way intelligence agencies are collecting information now due to the Edward Snowden leaks.

“In the past several years, because of the number of unauthorized disclosures and a lot of hand-wringing over the government’s role in the effort to try to uncover these terrorists, there have been policy and other legal changes that make our ability to collectively find these terrorists much more challenging,” Brennan explained.

Brennan stated the attacks must make the international community more open to sharing action and intelligence.

Earlier Monday, ISIS released a video warning of an attack on Washington, D.C., and several other European coalition nations that are bombing targets in Iraq and Syria.

“We say to the states that take part in the crusader campaign  that, by God, you will have a day, God willing, like France’s and by God, as we struck France in the center of its abode in Paris, then we swear that we will strike America at its center in Washington,” the militant said in the video, Reuters reports.

During a news conference at the G20 summit in Turkey, President Barack Obama said more nations “need to step up” in the fight against ISIS.

“Tragically Paris is not alone. We’ve seen outrageous attacks by ISIL in Beirut, last month in Ankara, routinely in Iraq. Here at the G20 our nations have sent an unmistakable message: That we are united against this threat. ISIL is the face of evil,” he said. “Our goal, as I’ve said many times, is to degrade and ultimately destroy this barbaric terrorist.”

However, Obama said, using a large number of U.S. troops on the ground to combat ISIS would be “a mistake.” He said the same view is held by his closest military and civilian advisers.

CBS News reports more than 150 police raids were conducted in France and Belgium overnight looking for more suspects behind Friday’s deadly terror attacks in Paris.

Belgian citizen Abdelhamid Abaaoud is believed to be the mastermind behind the attack. Abaaoud is currently believed to be in Syria.

An international arrest warrant has been issued for Salah Adbeslam, who CBS News reports is believed to have been the logistics man and rented one of the cars that was found near the Bataclan concert hall.

The terror attacks in Paris on Friday left 129 dead, and 350 others wounded.

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