Confronting another killing of police officers, President Barack Obama on Sunday urged Americans to tamp down inflammatory words and actions as a violent summer collides with the nation’s heated presidential campaign.

Obama said the motive behind Sunday’s killing of three officers in Baton Rouge, Louisiana, was still unknown. It was the latest in a string of deadly incidents involving law enforcement, including the police shooting of a black man in Baton Rouge and the killing of five officers in Dallas.

“We as a nation have to be loud and clear that nothing justifies attacks on law enforcement,” Obama said in remarks from the White House briefing room.

The president spoke on the eve of the Republican Party’s national convention, where Donald Trump will officially accept the GOP nomination. The businessman has cast the recent incidents as a sign that the country needs new leadership, often using heated rhetoric to make his point.

“Every one right now focus on words and actions that can unite this country rather than divide it further,” Obama said.

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