There have been clashes between police and protesters in Minneapolis after the death on Monday of an unarmed black man in police custody in the US city.
Police fired tear gas and protesters threw rocks and sprayed graffiti on police cars.
Video of the death shows George Floyd, 46, groaning "I can't breathe" as a white policeman kneels on his neck.
Four police officers have been fired, with the mayor saying that being black "should not be a death sentence".
Mayor Jacob Frey also called on prosecutors to file criminal charges against the policeman who was filmed holding Mr Floyd.
The incident echoes the case of Eric Garner, who was placed in a police chokehold in New York in 2014. His death became a rallying call against police brutality and was a driving force in the Black Lives Matter movement.
What happened at the protests?
They began in the afternoon on Tuesday, when hundreds of people came to the intersection where the incident had taken place on Monday evening.
Organisers tried to keep the protest peaceful and maintain coronavirus social distancing, with demonstrators chanting "I can't breathe," and "It could've been me".
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