On April 19, 1995, a bomb exploded at the Murrah Federal Building in Oklahoma City, Oklahoma, home to offices of a range of Federal agencies. 168 people were killed in this attack, and over 650 were wounded. At the time of this attack, this event marked the most deadly and destructive act of terrorism ever experienced in the United States.
National Consortium for the Study of Terrorism and Responses to Terrorism. 2010. "On the Fifteenth Anniversary of the Oklahoma City Bombing." College Park, MD: START (April).