The Berlin police arrested several demonstrators who marched through the fringes of a street festival in the city’s Kreuzberg neighborhood, for years the site of protests and violence during May Day rallies. The police said about 8,000 people took part in the march, some of whom lobbed bottles and fireworks at officers clad in riot gear keeping the demonstrators from the revelers.

Earlier in the day, 14,000 people marched elsewhere in Berlin under the banners of the German Federation of Trade Unions, calling for a reduction in the number of temporary contracts that companies can offer and for guaranteed social benefits for all employees. The march was one of hundreds organized by unions across the country that have faced dwindling membership in recent years.

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