A curfew is imposed and tear gas fired amid protests over the fatal shooting of Daunte Wright.
Tear gas has been fired and a curfew imposed amid angry protests after police fatally shot a black man in a traffic stop in the US city of Brooklyn Center, just north of Minneapolis.
The man has been identified by relatives as 20-year-old Daunte Wright.
Brooklyn Center’s mayor issued a city-wide curfew until 06:00 (11:00 GMT), telling people to “be safe, go home”.
Tensions in Minneapolis are high as the trial of a former officer accused of killing George Floyd takes place.
A courtroom just 10 miles (16km) from the latest unrest will resume proceedings on Monday, with the prosecution expected to begin wrapping up its case.
Minnesota Governor Tim Walz said he was “closely monitoring the situation” and praying for Mr Wright’s family.
Hundreds of protesters chanting Daunte Wright’s name gathered late on Sunday outside the police headquarters in Brooklyn Center.
Tensions rose as police donned riot gear, and two police vehicles were pelted with stones and jumped on, Reuters news agency reported.
Protesters wrote chalk on pavements and lit candles, but police later ordered the protesters to disperse, with footage showing tear gas and stun grenades being fired by officers.
Local media reported some looting taking place in a number of areas and Brooklyn Center Mayor Mike Elliott announced on Twitter he was issuing a curfew until 06:00.
“We want to make sure everyone is safe. Please be safe and please go home,” he wrote.
Some of the Minnesota National Guard, already deployed for the murder trial of Derek Chauvin over the death of George Floyd, were sent to Brooklyn Center.
Brooklyn Center has closed all school buildings, programmes and activities for Monday, local media report.
The BBC’s Samantha Granville at the scene in Brooklyn Center
Police officers stood shoulder-to-shoulder, creating a human barricade outside the Brooklyn Center Police Department.
They stood with helmets, shields and other riot gear, adamant about keeping the building safe.
Hundreds of protesters tried to inch forward, chanting: “If we don’t get no justice, they don’t get no peace.”
Some kneeled in front of the police with their hands on their heads. Others stood silently with signs that listed names of African Americans who had been killed by the police.
Among the crowd were some of Daunte Wright’s friends and relatives. Throughout the standoff, the police would fire off smoke and flash bombs if they thought protesters were getting too close, or if the crowd seemed it was getting too big and unmanageable.
It was an all-too-familiar scene for communities still reeling from the riots during the summer of 2020 in the aftermath of the killing of George Floyd.
As the verdict in the trial over his death looms, Sunday’s events show just how much those communities are on edge.
In a statement, the Brooklyn Center Police Department said officers had pulled a man over for a traffic violation on Sunday afternoon and determined that he had an outstanding arrest warrant.
They said that when police tried to arrest him, he re-entered the vehicle.
An officer then shot the driver, who drove on for several blocks before he crashed into another vehicle. He was pronounced dead at the scene.
A female passenger in the vehicle suffered non-life-threatening injuries.
Police said the officers involved were wearing body cameras, and dash cameras had also been activated.
Mr Wright’s mother, Katie, said her son had called her during the traffic stop and he said he had been pulled over because of “air fresheners hanging from his rear-view mirror”. She said she then heard scuffling and the phone line was cut.
“A minute later, I called and his girlfriend answered, who was the passenger in the car, and said that he’d been shot… and my son was laying there lifeless.”
She said her son’s body had been left on the ground by officers, adding: “Nobody will tell us anything. Nobody will talk to us… I said please take my son off the ground,” the StarTribune reported.
Mayor Elliott said the shooting was “tragic” and Governor Walz said: “Our state mourns another life of a black man taken by law enforcement.”
The murder trial of Derek Chauvin over the death of George Floyd has been under way in the city for two weeks now.
Mr Chauvin was filmed kneeling on Mr Floyd’s neck for more than nine minutes during an arrest operation in Minneapolis last May.
The footage of the incident sparked global protests against racism.
The trial is expected to last at least one month and law enforcement officials have already been bracing for possible unrest once the jury reaches a verdict.
George Floyd’s death sparked waves of protests around the city, many peaceful but some violent with hundreds of buildings damaged.