A suburban Minneapolis police officer apparently drew her gun by mistake, instead of her Taser, when she shot a young Black man to death during a traffic stop, a police chief said on Monday, hours before a second night of unrest sparked by the killing.

Family members of the slain motorist, Daunte Wright, 20, rejected the notion that a mere accident was to blame for Sunday's shooting in Brooklyn Center, Minnesota, with Wright's grieving brother denouncing the police as "trigger happy."

The shooting roiled a region already on edge, as last year's killing of George Floyd, a Black man who died with his neck pinned to a Minneapolis street under a white policeman's knee, was being recounted in graphic detail in the trial of former officer Derek Chauvin, charged with his murder.

Wright was killed just 10 miles from where Floyd, 46, lost his life while under arrest for allegedly passing a bogus $20 bill, unleashing a months-long nationwide upheaval of protests against racial injustice in the U.S. law enforcement system.

Brooklyn Center's police chief, Tim Gannon, said during a news briefing on Monday that Wright was pulled over for an expired vehicle registration and that the shooting was apparently unintentional, judging from his initial review of police video footage of the incident.

PORTLAND, OR - APRIL 12: A demonstrator faces off with police officers during a protest against the killing of Daunte Wright on April 12, 2021 in Portland, Oregon.

'ACCIDENTAL DISCHARGE'

"This appears to me, from what I viewed and the officers' reaction and distress immediately after, that this was an accidental discharge that resulted in the tragic death of Mr. Wright," said Gannon.

The Hennepin County medical examiner on Monday ruled the death a homicide, confirming in an autopsy that Wright was killed by a gunshot wound to the chest.

Sunday's shooting immediately ignited a night of street skirmishes between police and protesters in Brooklyn Center, with local news media reporting looting and burglaries of about 20 businesses at a nearby shopping center.

Disturbances flared anew on Monday, as hundreds of protesters braving a steady downpour and defying a curfew ordered by Governor Tim Walz clashed with law enforcement as darkness fell outside police headquarters in Brooklyn Center.

A crowd surged against a fence erected to keep protesters at bay, some hurling bottles and other projectiles and lighting off fireworks as police responded by firing volleys of tear gas and what appeared to be non-lethal plastic rounds.

A nearby discount store was looted and vandalized, but most of the demonstrators drifted away by 10 p.m. local time. As calm was restored, police reported 40 arrests in Brooklyn Center for offenses ranging from curfew violations to rioting charges.

Three officers suffered minor injuries from debris thrown at them, authorities said at a late-night news conference.

Police in Minneapolis said several people were arrested there in connection with five retail burglaries.

SEATTLE, WA - APRIL 12: A parking pay station is damaged during a protest over the death of Daunte Wright on April 12, 2021 in Seattle, Washington.

'BROKEN IN A THOUSAND PIECES'

During a memorial vigil Monday evening at the spot where Wright was killed, relatives remembered him as a good-natured father who worked multiple jobs to support his 2-year-old son and voiced anguish over his death at the hands of police.

"My brother lost his life because they were trigger happy," his older half sibling, Dallas Wright, told the crowd as rain began to fall.

"My heart is broken in a thousand pieces... I miss him so much, and it's only been a day," his mother, Katie Wright, said as she wept. "He was my life, he was my son and I can never get that back. Because of a mistake? Because of an accident?"

Wright's father, Aubrey, told the Washington Post his son had dropped out of high school a few years earlier due to a learning disability.

Police chief Gannon told reporters hours earlier that a routine traffic stop of Wright had escalated into a deadly confrontation when officers ran a check on his expired vehicle registration and found an outstanding warrant for him.

Police did not elaborate, but the New York Times cited public records showing a judge had issued a warrant for Wright's failure to appear in court on two misdemeanor charges last year.

Police video footage presented by Gannon showed one officer trying to handcuff Wright next to the car, before Wright broke free and got back into his car. At that point, a second officer yells, "Taser, Taser, Taser," before firing a single shot from her handgun, the video shows.

"Holy shit, I just shot him," the policewoman is heard to shout as the car rolls away with Wright still in the driver's seat. The car struck another vehicle and came to a stop moments later.

The police officer who fired the fatal shot, later identified as 26-year department veteran Kim Potter, who is white, was placed on administrative leave. Mayor Mike Elliott called for her immediate dismissal. 

PORTLAND, OR - APRIL 12: A Portland police officers officer tackles demonstrators after a riot was declared during a protest against the killing of Daunte Wright on April 12, 2021 in Portland, Oregon.

PORTLAND, OR - APRIL 12: A demonstrator faces off with police officers during a protest against the killing of Daunte Wright on April 12, 2021 in Portland, Oregon.

BROOKLYN CENTER, MINNESOTA - APRIL 12: Demonstrators face off with police outside of the Brooklyn Center police station on April 12, 2021 in Brooklyn Center, Minnesota.