On July 7, 2016, multiple shots were fired at a peaceful protest in downtown Dallas, held against the police killings of two black men from other states. The gunman, later identified as Micah Xavier Johnson, targeted police officers, killing five and injuring nine. Two bystanders were also injured. This marked the deadliest day for U.S. law enforcement since the September 11 attacks. Johnson told police during a standoff that he was upset about recent police shootings of black men and wanted to kill whites, especially white officers. After hours of negotiation failed, police resorted to a robot-delivered bomb, killing Johnson inside El Centro College.