Five police officers were killed during an attack on a peaceful demonstration in Dallas. Several officers and other civilians were also wounded in the ambush, the city's mayor said Friday morning. The ambush occurred Thursday evening during a protest against the killing of two black men by white police officers in Minnesota and Louisiana. police shooting.
Officers Killed in Dallas Ambush

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Dallas police stand watch near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas.

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A Dallas police officer, who did not want to be identified, takes a moment as she guards an intersection in the early morning after a shooting in downtown Dallas on July 8, 2016.

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A Dallas police officer covers his face as he stands with others outside the emergency room at Baylor University Medical Center, July 8, 2016.

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Dallas Police Chief David Brown leaves the Baylor University Medical Center after a visit on July 8, 2016.