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This video frame grab obtained September 23, 2016, and taken by Rakeyia Scott, courtesy of Curry Law Firm, shows the moments after the shooting of Keith Lamont Scott in Charlotte, North Carolina. Image Credit: AFP

Charlotte, North Carolina: The family of the African-American man whose death has triggered days of unrest in Charlotte, North Carolina, released a dramatic video of the police shooting, raising pressure on the authorities to make their own footage public.

The police have refused to release body-cam and dash-cam video of the shooting Tuesday, September 20, which they say shows Keith Lamont Scott posed officers a threat.

Scott's death is the latest in a string of police-involved killings of black men that have fanned outrage across America.

Hundreds of protesters were out again on Friday night calling for the release of the videos amid a greater presence of National Guard troops, but the atmosphere was calmer than during previous days.

A curfew beginning at midnight (0400 GMT) is in effect for a second night after protesters defied the order on Thursday, September 22.

Hundreds of demonstrators were also marching in the southern city of Atlanta in a protest calling for police reform organized by the NAACP, the black community's main civil rights organization.

Charlotte's case has also touched the US presidential race, with Democrat Hillary Clinton's campaign announcing her plan to visit the city on Sunday, September 25, before postponing it to a week later after Charlotte Mayor Jennifer Roberts asked both major candidates to delay visits, citing "very stretched resources for security."

Clinton weighed in about the video issue earlier Friday, tweeting that police should release its footage "without delay."

President Barack Obama called for understanding as he celebrated the opening of the Smithsonian's African American museum in Washington this weekend.