Three police officers were shot to death and three others wounded in Baton Rouge on Sunday, less than two weeks after a black man was killed by police in the Louisiana capital, sparking nationwide protests.

The officers in Baton Rouge were responding to a call of a man with a gun when shots were fired. Two Baton Rouge police officers and one sheriff's deputy were killed.

One gunman is dead and police believe he was the only one involved in the attack, Mike Edmonson, superintendent of the Louisiana State Police, said in a press conference.

"We do not have an active shooter scenario in Baton Rouge," Edmonson said.

It was not immediately clear whether there was a link between the shootings and the recent unrest over the police killings of black men in Baton Rouge and Minnesota.

Police did not give any information about a possible motive.

President Barack Obama condemned the "attack on law enforcement in Baton Rouge" and vowed that justice would be done.

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