Summary: At 9:02 a.m. on April 19, 1995, a truck bomb containing approximately 5,000 pounds of ammonium nitrate fertilizer exploded outside the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people and injuring more than 800 at the hands of Gulf War veteran Timothy McVeigh. It was the worst terrorist attack on U.S. soil until the September 11, 2001 World Trade Center attack.