Learn more about the apparent terror alliance.
Why you won't hear the term 'Muslim extremism' at President Obama's terrorism conference.
Egypt has opened a new front in the fight against ISIS.
Congressional Republicans are taking aim at President Obama's request to authorize war against ISIS.
Questions remain over Kayla Mueller's ordeal.
IS claims that a coalition airstrike killed an American woman on Friday.
As another reported deadline passed, the fate of two IS hostages remains unknown.
Learn more about the latest IS hostage crisis.
The holiday provides no break in the danger to Iraqi Christians.
Peshmerga forces are winning major victories in the fight against IS militants.