North Carolina’s governor has declared a state of emergency in the city of Charlotte, after violence erupted during a second night of protests over the police killing of a black man.
Keith Lamont Scott was shot dead by a black officer on Tuesday.
One protester remains in a critical condition after a “civilian on civilian” shooting, police said.
Mr Scott was the third black man killed by US police in a week. Such shootings have sparked nationwide protests.
Riot police in Charlotte used tear gas as they faced hundreds of protesters. The local police department said four officers were injured.
Earlier North Carolina Governor Pat McCrory said he had “initiated efforts” to deploy the national guard and highway patrol to help deal with the protests.