A former intelligence analyst was taken into custody Thursday after federal authorities unsealed an indictment accusing him of leaking more than a dozen classified national defense documents to a journalist.
Detailed counter-terrorism analysis from an expert: Understanding the nature of terrorist groups as social movements is the foundation for defeating them.
ISIS has lost some of its leadership through military strikes in recent months. What is the effect, and Is this terror group different from all the rest?
IHS managing editor, Glynn Cosker, gives us information on all six of the recent House Homeland Security Committee's 'Terror Threat Snapshot' reports.
The Obama administration is set to disclose how many people have been killed by U.S. drones and counterterrorism strikes since 2009.
Most Islamic terrorists are recent converts who know surprisingly little about Islam. Why do so many young people become jihadists?