LATEST: Deadly attack on Dallas police

The Latest on the shooting of police in Dallas during protests in response to fatal police shootings (all times local):WATCH: Live updates on Dallas sniper attack8:50 a.m.Dallas police chief David Brown says the suspect in the deadly attack on Dallas police officers scrawled letters in his own blood on the walls of the parking garage where officers cornered and later killed him.Brown told CNN's "State of the Union" on Sunday that Micah Johnson wrote lettering in blood before heading upstairs and