The police officer in Minnesota seen on video, kneeling on the neck of a black man who died, has been arrested.
Public Safety Commissioner John Harrington says Derek Chauvin was arrested on Friday in the death of George Floyd.
Derek Chauvin was fired following Floyd's death and is now charged with murder.
It follows three days of protests which have escalated into violence as a fire was set at a police precinct which had been abandoned by officers.
Minnesota Gov. Tim Walz called for 'swift justice' for those involved in Floyd's death.
Floyd was handcuffed and pleaded for air as the officer knelt on his neck.
The families of three black people who have been killed by police in Minnesota, Georgia and Kentucky are calling for national reforms and want to see better training for police.