Additional video exists of the shooting of unarmed South Carolina man Walter Scott by a police officer, the mayor of North Charleston, S.C., said Wednesday.

Mayor Keith Summey said the unreleased video is being held by the South Carolina Law Enforcement Division, which is investigating the slaying.

It was not clear what exactly the video showed, but he suggested it had come from a camera in the officer's car.

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Summey also announced that the municipality was planning to require body cameras for officers but said it would take time to train officers to use the devices.

Police officer Michael Slager, who has been charged with murder, shot Scott multiple times in the back as he ran away.

Scott is black and was unarmed. Slager is white.

Summey said he and Police Chief Eddie Driggers had met with Scott's family and praised them as "an outstanding family within our community."

He also said after Scott is buried, the city government would be undertaking unspecified measures to address community tensions inflamed by the shooting.

"We will be having some good open dialogue within the next 30 days,” he said.

The case attracted national attention Tuesday, after a video was published the appears to show Slager firing eight times at Scott. The officer told authorities he had feared for his life and that Scott had taken his stun gun in a scuffle.

Police reports said the fatal interaction occurred after Slager stopped Scott for having a broken taillight.

"I have watched the video, and I was sickened by what I saw," Driggers said.

White House press secretary Josh Earnest on Wednesday said the video is "awfully hard to watch" and bolsters the case that police officers should wear body cameras.

Scott's death is being looked at by the Department of Justice.

There have already been protests around the case. During the press conference, Summey and Driggers were interrupted several times by protesters who called out questions about the case.

Summey, who took most of the questions, resisted calls for Driggers to retake the podium. He said the police chief was not able to speak to parts of the investigation because it was being conducted by an outside agency.

The protests fit into a larger movement of people concerned with the way police officers treat minority communities that emerged after the shooting this summer of unarmed black teenager Michael Brown in Ferguson, Mo.

- Updated at 2:24 p.m.