The director of the U.S. Central Intelligence Agency says the United States has not underestimated the threat posed by the Islamic State group.

John Brennan said Monday the success by the United States and its coalition countries in containing the group’s momentum inside Iraq and Syria is “why I think they are looking abroad” to make attacks.

Brennan gave his remarks at the Global Security Forum on Monday at the Center for Strategic and International Studies (CSIS), a think tank in Washington D.C.

Asked whether the U.S. had underestimated the threat, Brennan said, “I don’t think we are underestimating the capability of ISIL,” using an alternate name for the group.

He told the audience that while it was “inevitable” that the Islamic State will try to carry out such attacks, “to me it is not inevitable that they are going to succeed.”

The Pentagon also said on Monday that it will boost intelligence sharing with France to prosecute threats around the globe, and specifically from ISIL.

In a statement, Press Secretary Peter Cook said that in the wake of the recent attack on France, the United States is standing strong with its oldest ally.

“Secretary of Defense Ash Carter and Director of National Intelligence Jim Clapper have provided new instructions that will enable U.S. military personnel to more easily share operational planning information and intelligence with our French counterparts on a range of shared challenges to the fullest extent allowed by existing law and policy,” Cook said.

Story by the Associated Press