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ISIS is allegedly using chemical weapons in Syria and Iraq, but U.S. officials have not confirmed these reports.
CNN's Ivan Watson profiles an American solider fighting with a Kurdish militia against ISIS forces in Syria.
As ISIS descends on Kobani near the Syria-Turkey border, Turkey says it won't go at it alone fighting ISIS on the ground.
A city on the Turkey-Syria border may fall to ISIS, bus U.S. airstrikes continue to target ISIS' operating headquarters.
ISIS continues to hold territory as airstrikes continue in Syria. Jim Sciutto has the latest.
Drew Griffin exclusively visits a meeting in Syria where moderate groups are coming together in the fight against ISIS.
Amid new U.S. airstrikes in Iraq and Syria, will terrorists retaliate by taking more hostages? CNN's Brian Todd reports.
Egyptian Foreign Minister Sameh Shoukry talks to CNN's Wolf Blitzer about Egypt's involvement against ISIS.
Pentagon Press Secretary Rear Admiral John Kirby tells Wolf Blitzer how successful the latest strikes against ISIS have been.
Brian Todd gets inside accounts of life in Raqqa, Syria, the ISIS stronghold bombed by the U.S. and its allies.