The 2016 shooting of Dallas police officers is the deadliest single incident for law enforcement officers in the U.S. since the September 11 attacks in 2001. On July 7, 2016, Micah Xavier Johnson ambushed and fired upon a group of Dallas Police Department (DPD) and Dallas Area Rapid Transit (DART) officers, killing five officers and injuring nine others. Two civilians were also wounded. The shooting happened at the end of a protest against the police killings of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota.