The heavily armed sniper who gunned down police officers in downtown Dallas specifically set out to kill as many white officers as he could, officials said. He was a military veteran who had served in Afghanistan, and kept an arsenal in his home that included bomb-making materials.
The ambush started with gunshots that killed five officers and sent screaming crowds scrambling for cover. Investigators determined Johnson was "the lone shooter in this incident," Dallas Mayor Mike Rawlings said.
"This was a mobile shooter who had written manifestos on how to shoot and move, shoot and move, and that's what he did," Rawlings said at a news conference.
After the shooting subsided, Mr. Johnson, wielding an assault rifle and a handgun, held the police off for hours in a parking garage, claiming to have planted explosives in the area, and threatening to kill more officers. In the end, the suspect was killed with an explosive delivered by a remote-controlled robot.