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Violence at a disputed Eritrean music festival in the German town of Giessen has left 22 police officers wounded.
Law enforcement officers fired tear gas and used water cannon to quell the unrest.
Videos showed throngs of men shouting and running on the streets.
"Twenty-two police were injured, mainly in incidents of stone-throwing," regional police said on Twitter.
About 1,000 police were deployed in this town of 80,000 residents north of Frankfurt after last year's festival descended into violence.
Between 2,000 and 3,000 people had been expected to attend this year's event, due to run until Sunday. Police did not give details of any arrests.