39 people were detained after assaulting police at a "nCoV party" with thousands of participants in the city of Frankfurt, Germany.

Five police officers were injured in the riots that took place around 3am on July 19, when they tried to prevent a scuffle involving about 30 people at the historic Opera square in Frankfurt.

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About 3,000 people, mostly young people, filled the square on July 18, but only about 500 to 800 people were there when the chaos broke out, police chief Gerhard Bereswill said at a news conference.

A small group of officers stepped in to assist one of the bleeding and ended the fight, but the crowd surrounded them.

"What I find most disgusting is that the people around me cheered and clapped when they took the bottle to beat my colleagues," Mr. Bereswill said.

The police were then mobilized to supplement and disperse the crowd on the square despite facing "bottle rain" from the angry crowd.

Eight people remain detained and face charges of disturbing the order.

The incident recalls the riots on Saturday night in Stuttgart last month, when hundreds of people attacked police with stones and bottles, smashing shops and looting.

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Many police cars and a bus stop were also attacked, causing thousands of euros in damage.

City officials will meet on July 20 to discuss measures to cope with instability.

Germany currently records more than 200,000 nCoV infections, of which more than 9,000 are fatal.