On July 7, 2016, Micah Xavier Johnson ambushed a group of police officers in Dallas, Texas, shooting and killing five officers, and injuring nine others. Two civilians were also wounded. Johnson was an Army Reserve Afghan War veteran and was angry over police shootings of Black men. 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, which had occurred in the preceding days.

Following the shooting, Johnson fled inside a building on the campus of El Centro College. Police followed him there, and a standoff ensued. In the early hours of July 8, police killed Johnson with a bomb attached to a remote control bomb disposal robot. It was the first time U.S. law enforcement had used a robot to kill a suspect.The shooting was the deadliest incident for U.S. law enforcement since the September 11, 2001 attacks, surpassing two related March 2009 shootings in Oakland, California, and a November 2009 ambush shooting in Lakewood, Washington, which had each resulted in the death of four police officers and the shooting deaths of both suspects.