At 9:02 a.m., on April 19, 1995, a massive explosion detonated outside the Alfred P. Murrah Federal Building in Oklahoma City, collapsing the 9-story building and killing 168, 19 of them children, and wounding more than 700. Convicted by the federal government and executed in June 2001, Gulf War veteran Timothy McVeigh claimed he acted alone. Yet, multiple eyewitnesses identified McVeigh at ground zero with unknown accomplices before and after the blast. The original indictment charged McVeigh, Terry Nichols, and "others unknown" with conspiracy and murder. Was the bombing part of a greater pattern of Middle East-sponsored terrorist attacks, including the 1993 World Trade Center attack, bombing of the Khobar Towers and the USS Cole, and 9/11? Were homegrown neo-Nazi militia groups involved?