Was This the Man Behind the 9/11 Attacks?

Apparently, U.S. investigators believe he is. Khalid Shaikh Mohammed, said to be at large in Afghanistan, is apparently a high-ranking official in the al-Qaida network and believed to have been involved, if not having masterminded the attacks. He's also wanted in connection with the first World Trade Center bombing back in 1993 and allegedly planning to fly a plane into the C.I.A. headquaters, among other things.