DALLAS, TX - JULY 11:  An American flag sits  by the scene of Thursday evenings shooting in downtown Dallas on July 11, 2016 in Dallas, Texas. Most of Dallas got back to work on Monday following an emotional and stressed filled weekend. Five police officers were killed and seven others were injured in the evening ambush during a march against recent police involved shootings.  The suspect, 25-year-old Micah Xavier Johnson of Mesquite, Texas, once served in the military. This is the deadliest incident for U.S. law enforcement since September 11.  (Photo by Spencer Platt/Getty Images)