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At least three police officers were shot dead in Baton Rouge on Sunday morning as they were responding to a call about a man with a gun.

The incident is the nation’s fourth high-profile deadly encounter involving police in the last two weeks. The shooting of Alton Sterling on July 5, captured in an agonizing video, triggered a Justice Department civil rights investigation. A day later, a police officer in Falcon Heights, Minn., fatally shot Philando Castile, a 32-year-old black man, during a traffic stop. On July 7, a gunman who claimed he was seeking revenge for Sterling’s and Castile’s deaths killed five police officers during a Black Lives Matter protest in Dallas.

What we know so far: