UPDATE, 11:20am ET: The Associated Press is identifying the gunman who murdered 5 Dallas police officers Thursday night as Micah Johnson, 25. Read more, here. UPDATE, 8:45am ET: The Dallas police chief said moments ago that the suspect in the ambush on police officers was killed using an explosive device detonated by a robot. He said the suspect was cornered. During negotiations, the man expressed that he was "upset about Black Lives Matter" and wanted to kill white people, especially police officers. Watch the latest above and read more here. Five Dallas police officers were killed and at least six more injured in a coordinated sniper attack during an anti-police brutality protest Thursday, an explosion of violence that President Obama declared a “vicious, calculated and despicable attack on law enforcement.” Three people were in custody and one suspect dead as local police and federal authorities raced to determine a motive and whether more people were involved in what was the nation's deadliest day for police since 9/11. The suspects were not cooperating, officials said. Law enforcement veterans told Fox News the attack was clearly coordinated and showed an alarming degree of planning and sophistication. 12 Officers Shot, 5 Dead at Dallas Protest; 1 Suspect Dead, 3 in Custody I just have no words for this.