About 40 people were arrested just north of Minneapolis in a second night of unrest over the police shooting of black man Daunte Wright.
Protesters in the city of Brooklyn Center defied a curfew and threw objects at police, who responded with flash grenades and tear gas.
The police chief said the 20-year-old was shot and died after an officer mistook her gun for a Taser.
The shooting came as the high-profile George Floyd murder trial continues in a courtroom just a few miles away.
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