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ISIS has released an audio tape in which one of its leaders calls for attacks against the West. Jim Sciutto reports.
Jim Sciutto reports that many intelligence officials now say they underestimated the threat posted by ISIS.
A training camp near the ISIS stronghold in northern Iraq became the target of U.S. warplanes. CNN's Jim Sciutto reports.
Testifying before Congress, Gen. Martin Dempsey didn't rule out sending U.S. military advisers in Iraq closer to combat.
CNN'S Jim Sciutto reports on which countries are joining the effort to battle ISIS and which ones are still hesitant.
With estimates about the number of ISIS fighters increasing, Jim Sciutto asks: what exactly is the U.S. up against?
The CIA now says there are between 20,000 to 31,500 ISIS fighters operating in Iraq and Syria. CNN's Jim Sciutto reports.
As President Obama gears up to reveal the strategy for containing ISIS, Jim Sciutto reports on what is known of the plan.
In an interview with CNN's Jim Sciutto, Secretary of Defense Chuck Hagel expressed anger and outrage towards ISIS.