A passing resident stops to pray for members of the North Carolina National Guard standing a post in Uptown Charlotte on Sept. 22, 2016 in Charlotte, North Carolina. (Photo by Brian Blanco/Getty Images)

CHARLOTTE, N.C. (CBSNewYork/AP) — 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” while briefly blocking an intersection near Bank of America headquarters in the heart of the city’s business district. They then continued marching as police officers watched. Members of the National Guard carrying rifles were also deployed in front of office buildings to head off another night of violence in this city on edge.

Mayor Jennifer Roberts has signed a curfew order from midnight until 6 a.m., despite Charlotte-Mecklenburg Police Chief Kerr Putney saying he saw no need for a curfew.

ALERT: @CLTMayor and @CMPD have enacted a citywide curfew beginning Sept. 23 imposed at midnight until 6 a.m. — City of Charlotte (@CLTgov) September 23, 2016

Officers warned protesters to disperse at times when they stopped in front of buildings, but the demonstration remained peaceful in the hour after darkness fell.

However, several dozen protesters have climbed onto Interstate 277, blocking traffic by standing in the middle of the highway.

A line of police officers with shields and face masks advanced on the protesters, and many dispersed and climbed back up embankments off the road.

Police in riot gear are on the expressway after protesters took of the highway. pic.twitter.com/Rd1uItiaVP — Yamiche Alcindor (@Yamiche) September 23, 2016

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.

PHOTOS: Violence Erupts In Charlotte For Second Night In Row

Putney said earlier in the day 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 is just 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 Tulsa, Oklahoma, on Thursday, prosecutors charged a white officer with manslaughter for killing an unarmed black man on a city street last week.

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. The NASCAR Hall of Fame was among the places damaged.

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.

The unrest has seemed at odds with Charlotte’s image as a diverse, forward-looking banking capital of the New South.

On Thursday, in a measure of how tense things had become, three of Charlotte’s major employers — Bank of America, Wells Fargo and Duke Energy — told thousands of employees not to venture into the city.

National Guard stands watch outside #OmniHotel tonight which was busted up by protesters last night. #WBTV pic.twitter.com/K9ZyX5YI77 — WBTV Ben Williamson (@benlwilliamson) September 23, 2016

In addition to the National Guardsmen, North Carolina state troopers and U.S. Justice Department conflict-resolution experts were sent to keep the peace.

Police have said that Scott was shot to death Tuesday by a black officer after he disregarded loud, repeated warnings to drop his gun. Neighbors, though, have said he was holding only a book. The police chief said a gun was found next to the dead man, and there was no book.

Putney said that he has seen the video and it does not contain “absolute, definitive evidence that would confirm that a person was pointing a gun.” But he added: “When taken in the totality of all the other evidence, it supports what we said.”

Justin Bamberg, an attorney for Scott’s family, watched the video with the slain man’s relatives. He said Scott gets out of his vehicle calmly.

“While police did give him several commands, he did not aggressively approach them or raise his hands at members of law enforcement at any time. It is impossible to discern from the videos what, if anything, Mr. Scott is holding in his hands,” Bamberg said in a statement.

Scott was shot as he walked slowly backward with his hands by his side, Bamberg said.

The lawyer said at a news conference earlier in the day that Scott’s wife saw him get shot, “and that’s something she will never, ever forget.” That is the first time anyone connected with the case has said the wife witnessed the shooting. Bamberg gave no details on what the wife saw.

Experts who track shootings by police noted that the release of videos can often quell protest violence, and that the footage sometimes shows that events unfolded differently than the official account.

“What we’ve seen in too many situations now is that the videos tell the truth and the police who were involved in the shooting tell lies,” said Randolph McLaughlin, a professor at Pace University School of Law. He said it is “irresponsible” of police not to release the video immediately.

Other cities have released footage of police shootings. Just this week, Tulsa police let the public see video of the disputed Sept. 16 shooting, though the footage left important questions unanswered.

Last year, a Chicago police officer was charged with murder the same day the city released dashcam video that showed him shooting black teenager Laquan McDonald 16 times, footage that contradicted the accounts of officers who said the teen swung a knife at them.

“We all stand together declaring there must be transparency and the videos must be released,” the Rev. William Barber, president of the North Carolina NAACP, said at a news conference. “At this point, there is speculation because the videos have not been released. Be clear: There is unrest in Charlotte and across America because of what we do know.”

The police chief acknowledged that he has promised transparency in the investigation, but said, “I’m telling you right now, if you think I say we should display a victim’s worst day for consumption, that is not the transparency I’m speaking of.”

(TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)