Four US police officers involved in the arrest of a black man who died in custody in Minneapolis have been fired after a bystander's video of the arrest emerged.
The video showed a white police officer, Derek Chauvin, arresting an African-American man, George Floyd, who said he could not breathe as Mr Chauvin knelt on his kneck.
Minneapolis Mayor Jacob Frey tweeted about the firings, saying "this is the right call".
Mr Floyd's death after he struggled with officers on Monday night is under investigation by the FBI and state law enforcement authorities.
Mr Frey apologised to the black community on Tuesday in a post on his Facebook page.
"Being Black in America should not be a death sentence. For five minutes, we watched a white officer press his knee into a Black man's neck. Five minutes. When you hear someone calling for help, you're supposed to help. This officer failed in the most basic, human sense," Mr Frey posted.
Police said the man matched the description of a suspect in a forgery case at a grocery store, and that he resisted arrest.
'I can't breathe'
The video shows Mr Chauvin ignoring the Mr Floyd's pleas.
"Please, please, please, I can't breathe. Please, man," Mr Floyd is heard telling the officer.
After several minutes, one of the officers tells the man to "relax".
Minutes pass, and the man becomes motionless under the officer's restraint.
The officer leaves his knee on the man's neck for several minutes more.
Bystanders became increasingly agitated as the man pleaded with police.
One bystander told officers they need to let him breathe. Another yelled at them to check the man's pulse.
Mr Floyd was later identified by prominent civil rights and personal injury lawyer Ben Crump, who said he had been hired by Mr Floyd's family.
"This abusive, excessive and inhumane use of force cost the life of a man who was being detained by the police for questioning about a non-violent charge," Mr Crump said in a statement.
The video drew immediate comparisons to the 2014 death of another unarmed black man Eric Garner in New York City, who was also heard telling officers "I can't breathe" as they held him in a choke hold while arresting him for selling cigarettes.
Since then, "I can't breathe" has become a uniting call of the US's Black Lives Matter movement and its protests against police brutality.
Police department under fire
The incident is the latest in a series of controversies surrounding the Minneapolis Police Department.
Ms Damond, 40, called 911 just before midnight one night in July 2017 when she heard a woman's screams near the alley behind her house.
She approached the police car as it arrived and Noor, seated in the front passenger seat, shot out the open driver's window and fatally struck Ms Damond in the stomach.
Other recent racially charged fatal police shootings in the Minneapolis-St Paul twin cities include two white police officers shooting dead 24-year-old Jamar Clark during a 2015 scuffle.
The police officers were not charged.
In 2017 a police officer was acquitted after shooting dead Philando Castile during a traffic stop while Castile's girlfriend live-streamed the incident.
