9/11 Perpetrators: Where Are They Now?

An update on the behind-the-scenes planners of the Sept. 11 attacks.

Sept. 11, 2010— -- While 19 hijackers were among the nearly 3,000 people who died in the Sept. 11, 2001 attacks, many of the men said to be responsible for the worst terrorist incident in U.S. history were nowhere near Washington or New York that morning. Some of the prime actors have been captured or killed, while others remain at large nine years later.