Leader of al-Qaida terrorist network oversaw 9/11 attacks

In this Sept. 11, 2001 file photo, smoke, flames and debris erupt from one of the World Trade Center towers after a plane strikes it, in New York. The first tower was already burning following a similar attack minutes earlier. Osama bin Laden, the glowering mastermind behind the Sept. 11, 2001, terror attacks that killed thousands of Americans, was slain in his luxury hideout in Pakistan in a firefight with U.S. forces,. (AP Photo/Chao Soi Cheong, File)