Dallas gunman wrote in blood on garage wall before he was killed

Police believe the gunman who killed five Dallas police officers had plans for a larger attack, but acted in response to two deadly police shootings in Minnesota and Louisiana last week. Investigators are now combing through items belonging to the shooter, 25-year-old Micah Johnson, working to decipher the cryptic letters he wrote with his blood before he died.The New York Post reports Johnson wrote "RB" in blood on a parking garage wall before police closed in on him. Sources told the paper Joh