US police in the city of Charlotte say they are evacuating their headquarters as a bomb squad investigates a suspicious package.
Images taken near the police headquarters on Tuesday show officers blocking off streets, a week after a black man was shot to death by police.
The city has been besieged by protests for the past week, with some of them turning violent with fires and looting.
More than 80 arrests have been made.
Police have said Keith Scott was armed with a handgun and officers told him repeatedly to drop the weapon before he was shot to death. Scott's family says he was not armed.
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