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.
Police say one protester remains in a critical condition after a “civilian on civilian” shooting.
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.
North Carolina Governor Pat McCrory said he had “initiated efforts” to deploy the National Guard and highway patrol to help deal with the protests.
“Any violence directed toward our citizens or police officers or destruction of property should not be tolerated,” he said.
The demonstrators are angry that Mr Scott, 43, was killed by police on Tuesday afternoon, at a block of flats in disputed circumstances.
Police were serving an arrest warrant on another person when they say they saw Mr Scott get out of a car with a handgun.
Officers say he was repeatedly told to drop his handgun before he was shot but his family says “he was reading a book, as he waited for his son to be dropped off by the school bus.”
“Dash-cam footage of the incident will be viewed by Charlotte’s mayor but not released to the public “at that time,” the city said.
It is legal to openly carry a handgun in North Carolina but a special permit is required to carry a concealed weapon.
State of Emergency
Governor McCrory declared the state of emergency as rioters clashed with police, breaking windows and setting small fires.
The second night of protests had begun peacefully but the demonstration was interrupted by gunfire and a man in the crowd was injured. The city initially said he had been killed but then issued a clarification.
Protesters then threw bottles and fireworks at the officers, who were lined up in riot gear. Police fired flash grenades and tear gas to repel the crowds.
Police in Charlotte defended their actions in the death of Mr Scott by insisting he had been repeatedly warned to drop his gun.
Charlotte-Mecklenburg Police Chief Kerr Putney told a news conference that Mr Scott first got out of the car with a gun, then got back into his vehicle when officers told him to drop his weapon.
He was shot when he emerged from his car holding his weapon. The police chief was unable to say if Mr Scott had been pointing his weapon at officers.