Twelve police officers have been injured during protests sparked by the police shooting of a black man in Charlotte, North Carolina.
Demonstrators destroyed marked police cars around the block of flats where the shooting took place, the Charlotte-Mecklenburg Police Department tweeted.
One officer was hit in the face with a rock, it said.
Earlier on Tuesday, Keith Lamont Scott, 43, was shot by a black officer and died in hospital.
Police say he was carrying a gun and posed "imminent deadly threat", but relatives told local media he was not holding a weapon but a book.
Protesters outraged over the incident blocked streets and police used tear gas, local media reported.
The unrest came a day after police in the city of Tulsa, in Oklahoma, said a black man they had killed on Friday was unarmed.
Hundreds of people have been protesting outside police headquarters there.
Terence Crutcher was walking away with his hands in the air when he was shot by police.