Three in custody, fourth suspect in gunbattle with police after sniper ambush kills five Dallas officers

Three people are in custody after snipers opened fire on police officers during protests in Dallas and a fourth person is exchanging gunfire with authorities, Police Chief David Brown said early on Friday morning.

Authorities are negotiating with a suspect in a downtown parking garage who has been firing at officers, Brown said at a news conference.

The suspect is not cooperating and has told negotiators he intends to hurt more law enforcement officials, the chief said.

Dallas police said a person of interest whose picture had been circulated has turned himself in.

Police earlier had circulated a picture of a man in a camouflage T-shirt who carrying a long gun but later cleared him of charges, according to media reports.