Omar Khadr was 15 when he was captured in Afghanistan in 2002. He was held in Guantanamo for years without charges. He was tortured. And earlier this month, after nearly 13 years behind bars, he was released on bail.

On the psychology of mass killer Anders Behring Breivik.

Dzhokhar Tsarnaev’s friends didn’t realize what he’d done until they saw his image on television.

A profile of Judy Clarke, the publicity-shy anti-death-penalty attorney, who has defended the Unabomber, Susan Smith, and Jared Loughner.

One man’s story.

Gerry Adams, the leader of Sinn Fein, denies that he was ever in the IRA. The murder of Jean McConville threatened to expose him as a liar.

Reconstructing the investigation into Rafik Hariri’s assassination, for which five men stand trial in absentia.

How a woman born of wealth and privilege tries to bomb the establishment from which she came and ultimately dies in the process.

This Pulitzer-winning series is reprinted online in full and for the first time by Longform.

Chérif and Saïd Kouachi’s path to the Paris attack at Charlie Hebdo.

The N.S.A. claims it needs access to all our phone records. But is that the best way to catch a terrorist?

Michel Houellebecq on his controversial new novel, Submission, which imagines France electing its first Muslim president.

An Islamic State senior commander reveals the terror group’s origins.

More than 500 Germans, including a former rapper named Deso Dogg, have joined ISIS in Syria.

A man, a woman, and a child negotiate their uneasy triangle in the days and weeks following 9/11.

"His briefcase sat beside the table like something yanked out of a landfill. He said there was a shirt coming down out of the sky."

While war raged across Afghanistan, expats lived in a bubble of good times and easy money. But as the U.S. withdraws, life has taken a deadly turn.

Accused of being part of a terror cell at age 12, Gitmo’s youngest prisoner recounts his life

How divisions between Nigeria’s Muslim North and Christian South resulted in the birth of terror’s most ruthless movement.

How America is trying to fight terrorism in Africa without doing any of the actual fighting.

The saga of Naji Mansour.

In northern Nigeria, radical Islamic terrorist group Boko Haram is facing a vigilante backlash from armed teenagers with nothing to lose.

Eleven members of an Australian rugby club traveled to Bali. After a bomb went off at a nightclub, only five of them made it home.

An investigation into the family of the accused Boston Marathon bombers.

An act of terror at an art museum.

"When – with difficulty – I made my way into the centre of the space, or what seemed like the centre of the space, I saw that one door was obscured by rags of hanging debris, and I turned and began to work in the other direction. There, the lintel had fallen, dumping a pile of brick almost as tall as I was and leaving a smoky space at the top big enough to drive a car through. Laboriously I began to climb and scramble for it – over and around the chunks of concrete – but I had not got very far when I realised that I was going to have to go the other way. Faint traces of fire licked down the far walls of what had been the exhibition shop, spitting and sparkling in the dim, some of it well below the level where the floor should have been."

An inside account of the Nairobi mall attack.