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Charlotte, N.C. • Protesters massed on Charlotte's streets for a third night Thursday in the latest sign of mounting pressure for police to release video that could resolve wildly different accounts of the shooting of a black man.

Demonstrators chanted "release the tape" and "we want the tape" while briefly blocking an intersection near Bank of America headquarters and later climbing the steps in front of the city government center. Later, several dozen demonstrators climbed onto an interstate highway through the city, but they were pushed back by police in riot gear.

Still, the protests lacked the violence and property damage of previous nights — and a midnight curfew imposed by the mayor aimed to add a firm stopping point for the demonstrations. Local officers' ranks were augmented by members of the National Guard carrying rifles and guarding office buildings against the threat of property damage.

So far, police have resisted releasing police dashcam and body camera footage of the death of 43-year Keith Lamont Scott earlier this week. His family was shown the footage Thursday and demanded that police release it to the public. The family's lawyer said he couldn't tell whether Scott was holding a gun.

But Charlotte-Mecklenburg Police Chief Kerr Putney said earlier in the day that releasing the footage of Scott's killing could undermine the investigation. He told reporters the video will be made public when he believes there is a "compelling reason" to do so.

"You shouldn't expect it to be released," Putney said. "I'm not going to jeopardize the investigation."

Charlotte Mayor Jennifer Roberts waited until Thursday's protests were underway for more than an hour before signing documents for the citywide curfew that runs from midnight to 6 a.m. The curfew will last for multiple days until officials determine the emergency has passed.

In an interview with CNN, Roberts said she thought the curfew was the most effective way to maintain peace in the city.

Charlotte is the latest U.S. city to be shaken by protests and recriminations over the death of a black man at the hands of police, a list that includes Baltimore, Milwaukee, Chicago, New York and Ferguson, Missouri.

In Charlotte, scores of rioters Wednesday night attacked reporters and others, set fires and smashed windows of hotels, office buildings and restaurants in the city's bustling downtown section.

Forty-four people were arrested after Wednesday's protests, and one protester who was shot died at the hospital Thursday; city officials said police did not shoot the man and no arrests have been made in 26-year-old Justin Carr's death.