A 48-hour reconstruction of the Breitscheidplatz Attack and the political response.

A search for meaning through academics, cultural studies, and terrorism.

A minute by minute account of the officers and first responders on the scene of the San Bernadino shooting and the subsequent firefight between police and and the Farooks.

“As my acting career developed, I was no longer cast as a radical Muslim – except at the airport.”

The investigators tasked with finding jihadists embedded within Europe.

“There was no they.' There was not even a 'he,' no armed person turning on a crowd. But what happened at JFK last night was, in every respect but the violence, a mass shooting.”

Since 9/11, the United States has spent $1 trillion on national security. An investigation into whether it has worked.

The story of Deso Dogg, a German rapper-turned-ISIS propagandist who may or may not have been killed in an airstrike.

How ISIS trains the children it captures.

An interview with Dallas Police Chief David O. Brown.

Cars driving themselves into walls. Hospitals frozen. Elevators jammed. A scenario that could happen based on what already has.

Who was Omar Mateen?

A novel interrogation technique is transforming the art of detective work: Shut up and let the suspect do the talking.

David Vincenzetti says his company, which sells spyware to world’s law enforcement and intelligence agencies, is helping to thwart terrorism. Others say it’s a danger to citizens, dissidents, and journalists alike.

Why ISIS is winning the social media war.

Life and death with the young and radicalized.

After his daughter died in a terrorist attack, Stephen Flatow won an unprecedented judgment against her killers. Then he had to figure out how to actually collect.

A report from the border of ISIS territory in Iraq, where civilians are battling to survive.

The DEA warns that drugs are funding terror. But is the agency stopping threats or staging them?

On the response to the Paris attacks.

Ken Dornstein’s older brother died when a bomb exploded on Pan Am Flight 103. For the past three decades, he’s been obsessed with identifying who’s really responsible.

The family accused of funding the Pakistani Taliban.

An isolated 23-year-old Sunday school teacher living with her grandparents makes a new group of friends online who mail her chocolates and cash.

Feeling abandoned by America, families fight to save their children from ISIS.

A profile of Moktar Belmoktar, Al-Qaida’s “most difficult employee,” who was responsible for a major attack on an Algerian BP plant and, according to U.S. and Libyan forces, was killed in an air strike on Sunday.