A police station in Minneapolis has been set alight during a third night of protests over the death of an unarmed black man in custody.
The unrest continued despite the governor of Minnesota ordering the deployment of hundreds of members of the National Guard to restore order.
President Donald Trump said “thugs” were “dishonouring the memory” of George Floyd, 46, who died on Monday. Video showed him gasping for breath as a white policeman knelt on his neck.
Mr Floyd’s family have demanded the four police officers implicated in his death face murder charges. But prosecutors have said they are still gathering evidence.
The incident has added to longstanding anger over the police killings of black Americans, including the recent case of Breonna Taylor in Kentucky.