Fired police officer Derek Chauvin has been arrested four days after he was filmed kneeling on the neck of black man George Floyd during his arrest.
The former Minneapolis cop was taken into custody by the Bureau of Criminal Apprehension on Friday afternoon, according to local media.
No further information has been released.
Floyd was seen in a video on Monday pleading that he couldn't breathe as white officer Derek Chauvin pressed his knee against his neck.
Ellison, the Attorney General, told CNN that officials are ensuring they have 'a very strong case' before announcing charges.
'Everybody believes that this is a violation of Mr Floyd,' Ellison said.
'And I believe that everybody wants to see these charges filed as soon as they can be. But again, I do want to say we have seen cases that seem so clear go south.'
Chauvin and the other three officers in Floyd's arrest - J Alexander Kueng, Thomas Lane and Tou Thao - were fired but say they don't plan to cooperate.
Prosecutors on Thursday had warned there was 'evidence that does not support criminal charges' in the case of four cops accused of killing George Floyd, as they say police can use a 'certain amount of force - but not excessive'.
At a press conference Mike Freeman, county attorney for Hennepin County, condemned the actions of white cop Derek Chauvin as 'horrific and terrible', but said prosecutors needed to determine if he used 'excessive' force when he knelt on the black man's neck for eight minutes until he passed out and later died.
'That video is graphic and horrific and terrible and no person should do that,' he said.
'But my job in the end is to prove he violated a criminal statute - but there is other evidence that does not support a criminal charge.'
Freeman pleaded for patience from the Minneapolis community ravaged by Floyd's death as he warned that the investigation 'can't be rushed' for fear of a repeat of the Freddie Gray case in 2015 where all charges were dropped against cops involved in the black man's death.
More to come.