A U.S. Army Reserve veteran ambushed and shot at police officers (memorial service pictured) in Dallas, killing five of them and injuring nine others, before being killed by a bomb attached to a police robot. 2016 shooting of Dallas police officers: On July 7, 2016, Micah Xavier Johnson ambushed and shot police officers in Dallas, Texas, killing five, injuring nine others, and wounding two civilians. Johnson, a 25-year-old Army Reserve Afghan War veteran, was angry over police shootings of black men. He shot the officers at the end of a protest against the recent killings by police of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota. July 7, 2016. Wiki link