A police officer fired following the death of an unarmed black man in Minneapolis has been arrested and charged with murder and manslaughter.
Derek Chauvin was shown in footage kneeling on George Floyd’s neck. Three other officers were sacked over the fatality on Monday.
Days of looting and arson in the Minnesota city have boiled over into nationwide protests.
The case has reignited US anger over police killings of black Americans.
Hennepin County Prosecutor Mike Freeman said Mr Chauvin was charged with third degree murder and noted that the investigation of the other officers is ongoing.
He said he “anticipates charges” for the three other officers but would not offer more details.
Mr Freeman said his office “charged this case as quickly as evidence has been presented to us”.
“This is by far the fastest that we’ve ever charged a police officer,” he noted.
Shortly after the charges were announced, US Attorney General William Barr said that the justice department and FBI are conducting “an independent investigation to determine whether any federal civil rights laws were violated”.
Mr Barr called the video of Mr Floyd’s arrest “harrowing to watch and deeply disturbing”.
On Thursday, during the third night of protests over Mr Floyd’s death, a police station was set alight. A number of buildings have been burned, looted and vandalised in recent days, prompting the activation of the state’s National Guard troops.