CIA director anticipates more ISIS attacks 'in the pipeline'

CIA director anticipates more ISIS attacks 'in the pipeline'
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CIA Director John BrennanJohn Owen BrennanFormer intelligence chiefs slam Trump for removing officials Ex-CIA chief calls Trump intel shakeup a 'virtual decapitation' of the intelligence community DOJ attorney looking into whether CIA withheld info during start of Russia probe: NYT MORE said Monday that the Islamic State in Iraq and Syria (ISIS) may have more terrorist attacks "in the pipeline."

"I certainly would not consider it a one-off event," Brennan said at a conference hosted by the Center for Strategic and International Studies.

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"I would anticipate this is not the only operation that ISIL has in the pipeline," he said, using an alternate acronym for the group.

Brennan also added, "I think here in the United States we have to be quite vigilant."  

French authorities have pinned responsibility for a wave of terrorist attacks in Paris that killed more than 120 on ISIS, and the U.S. over the weekend has said it has no evidence to disprove that. 

Brennan called the Paris attacks "fairly sophisticated." 

"Clearly there was an effort that was underway for quite some time, that was fairly sophisticated, because of the nature of the attacks, in terms of their simultaneous nature," he said. "This is not something that was done over a course of days."

The attacks marked an increasing shift by the terrorist organization from solely establishing a caliphate in Iraq and Syria, to launching terror attacks outside the region. 

ISIS has also claimed responsibility for recently bombing a Russian airliner that killed more than 220 passengers. 

Brennan said the attacks were not a surprise "from the standpoint that we did have strategic warning."

"We knew that these plans or plotting by ISIL was underway, looking at Europe in particular as the venue for carrying out these attacks," he said.

However, he also said European allies have been strained due to the influx of refugees across their borders. 

He added that there has been a "significant increase" in the way terrorist operatives and networks evade detection from authorities. 

"There are a lot of technological capabilities that are available right now that make it exceptionally difficult, both technically as well as legally, for intelligence security services to have the insight that they need to uncover it," he explained.