Image Mr. Clark, in an undated photograph. Credit... Javille Burns, via Associated Press

Wednesday’s unrest came after officials met two of the protesters’ demands by starting a federal civil rights investigation into the shooting and by releasing the names of the two officers involved. The officers, Mark Ringgenberg and Dustin Schwarze, are both seven-year veterans of law enforcement but are relatively new to the Minneapolis force, with each having worked there for 13 months.

Minneapolis is the latest American city to experience protests over the death of a black person at the hands of police. Since Michael Brown, an unarmed black 18-year-old, was fatally shot in August 2014 by an officer in Ferguson, Mo., large demonstrations have taken place over violent episodes in several cities, including Baltimore, Cleveland and New York.

As in some other cases, Minneapolis protesters have sought video evidence to resolve discrepancies between the accounts of the police and of witnesses. The police said Mr. Clark was a suspect in an assault and that he had interfered with paramedics attempting to treat his victim. When officers arrived, the police said, he fought with them, leading to the gunfire. Some who said they witnessed the incident disputed that account, saying on social media or to local reporters that Mr. Clark was handcuffed when he was shot.

Drew Evans, the superintendent of the Minnesota Bureau of Criminal Apprehension, which is conducting the state investigation, has said the officers involved were not wearing body cameras and that there was no dashboard camera video from police cruisers. Mr. Evans said that cellphone video, surveillance footage from nearby buildings and a camera in an ambulance had all captured portions of the encounter, but not all of it. Mr. Evans said releasing that footage immediately, as protesters have requested, could compromise the investigation.

At a news conference on Wednesday morning, Javille Burns, a sister of Mr. Clark’s, said her brother was well regarded by people in his neighborhood and that he “did not deserve” to die.

“We don’t want revenge,” Ms. Burns said. “We do want justice.”