The resignations of a police chief and of an officer who shot dead a Daunte Wright in Minnesota have failed to end unrest over Sunday’s killing.
Chief Tim Gannon and Officer Kim Potter have quit the Brooklyn Center force.
Mrs Potter said she shot Daunte Wright accidentally, having mistakenly drawn her gun instead of her Taser, a stance backed by Mr Gannon.
Despite the resignations fresh clashes between police and protesters erupted for a third night.
Mr Wright’s mother has been speaking about her last phone call to her son. In tears, she told reporters she could never have imagined he would be killed.
The death happened in a suburb of Minneapolis, a city already on edge amid the trial of a white ex-police officer accused of murdering African American George Floyd.
On Tuesday night bottles and other projectiles were thrown at the Brooklyn Center police headquarters and officers responded by firing tear gas, stun grenades and rubber bullets.
More than 60 people were arrested, Minnesota State Patrol Colonel Matt Langer told reporters.
Another demonstration broke out in Portland, Oregon, on Tuesday night, with about 100 protesters marching on the Portland Police Association Building.
Flames were seen coming out of the side of the police building about an hour later. The Portland Police Bureau declared the gathering a riot
Speaking to reporters earlier, Brooklyn Center Mayor Mike Elliott said he had appointed 19-year veteran Tony Gruenig to take over for Tim Gannon.
On Monday, Mr Gannon had said the shooting of Mr Wright appeared to be an “accidental discharge” after Mrs Potter mistook her service pistol for a stun gun.
“I appreciate the officer stepping down,” the mayor said, adding that he hoped her leaving would “bring some calm to the community”.
He said the city had intended to fire Mrs Potter. “We want to send a message to the community that we are taking this situation seriously,” he added.
Meanwhile, prosecutors are expected to decide whether to charge Mrs Potter on Wednesday, the Associated Press news agency reported.
“We have to make sure that justice is served… Daunte Wright deserves that. His family deserves that,” Mr Elliott said.
The Wright family have spoken of their ordeal on the night Daunte was killed, holding a news conference near the courthouse where police officer Derek Chauvin is standing trial for George Floyd’s murder.
In an emotional speech, his mother Katie described what she said was the worst day of her life.
She said her son called her after he was pulled over, and that she offered to give insurance details to police over the phone.
She said she heard police order him to get out of the vehicle. There was a scuffling sound and an officer told him to hang up the phone.
When she was eventually able to call back, his girlfriend answered and told her he had been shot.
“She pointed the phone toward the driver’s seat and my son was laying there, unresponsive,” she said in tears.
“That was the last time that I’ve seen my son.”
The family were joined by relatives of George Floyd and by Ben Crump, a lawyer who is representing both families.
Mr Wright’s aunt Naisha angrily dismissed Mrs Potter’s explanation of the killing.
“Every pistol, every Taser has a safety on it,” she said.
“I watched that video like everybody else watched that video. That woman held that gun in front of her a long damn time.”