An analysis of 30,000 Twitter accounts provides a map of online extremists—and reveals that support for Trump is what holds them together.
Two mass murders reveal how difficult—and important—it is to correctly identify terrorism when it occurs.
Protests scheduled in nine American cities for Saturday will provide a sense of where the movement is headed.
The violence ISIS carries out in the west provides fodder for anti-Muslim attackers, and violence against Muslims feeds back into the ISIS narrative.
How a self-published, racist novel changed white nationalism and inspired decades of violence
The Islamic State isn’t succeeding because of the strength of its narrative. It’s succeeding because it can mobilize a microscopic minority.
Even with fewer clicks
Why do people travel abroad to take part in somebody else’s violent conflict?
The militant group that conquered northern Iraq is deploying a sophisticated social-media strategy.
In the timeline of the hijackers' movements in the months before the attacks, New Mexico-born Awlaki and his followers seem to turn up nearly every step of the way
What's driving jihadist self-starters to break from the world's most famous terrorist group?