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The CIA now says there are between 20,000 to 31,500 ISIS fighters operating in Iraq and Syria. CNN's Jim Sciutto reports.
The White House says it has identified ISIS targets in Syria, but not everyone is on board with the President's plan.
Brian Todd takes a look at the information on the "Laptop of Doom" and what it exposes about ISIS' plans for attacks.
CNN's Brian Todd looks at why the U.S. military hasn't specifically targeted ISIS leaders during airstrikes.
ISIS is targeting Twitter employees for shutting down and suspending their accounts. CNN's Pamela Brown reports.
As President Obama gears up to reveal the strategy for containing ISIS, Jim Sciutto reports on what is known of the plan.
Brian Todd reports on a new video from ISIS showing what appears to be combat footage and heavy weaponry.
Do ISIS' slickly-produced videos emulate Hollywood movies? CNN's Brian Todd looked into the terror group's techniques and followed up his report by answering your questions on Twitter.
Here are some highlights from his Twitter Q&A:
The United States' strategy to degrade and destroy ISIS may be taking shape. CNN's Barbara Starr reports.