Police Officers Killed During Anti-Police Brutality March In Dallas

The flags in front of Dallas City Hall were lowered to half mast against the skyline after the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. (Photo by Stewart F. House/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police stand watch near the scene where Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

A Dallas police helicopter flies over the scene where Dallas police officers were shot and five have now died on July 8, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police work near the scene where eleven Dallas police officers were shot and five have now died on July 8, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police officers escort residents near the scene where Dallas police officers were shot and five have now died on July 8, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police officers escort residents near the scene where Dallas police officers were shot and five have now died on July 8, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police officers escort a woman near the scene where Dallas police officers were shot and five have now died on July 8, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas police and residents stand near the scene where Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. (Photo by Ron Jenkins/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police officers stand guard at a barricade following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Protestors yell after police officers arrest a bystander following the shooting at a protest in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas Mayor Mike Rawlings (R) looks on during a press conference at Dallas City Hall as Dallas Police Chief David Brown speaks on the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. (Photo by Stewart F. House/Getty Images)

Dallas Police Shootings

A police officer stands guard at a barricade following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Police officers stand guard at a barricade following the sniper shooting in Dallas on July 7, 2016. (LAURA BUCKMAN/AFP/Getty Images)

Five Police Officers Killed During Anti-Police Brutality March In Dallas

Dallas Mayor Mike Rawlings (R) conducts a press conference at Dallas City Hall as Dallas Police Chief David Brown looks on in front of a diagram showing the area of downtown which is closed to the public during an investigation of the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. (Photo by Stewart F. House/Getty Images)