The Berlin police broke up two parties with several hundred revelers at Schlachtensee and Krumme Lanke.
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The guests caused noise and a lot of rubbish on the banks of the water in the south-west of the capital on Friday evening, a police spokesman said on Saturday.
The young people had brought jukeboxes, alcohol and, in two cases, drugs to the conservation area.
Officials cleared the parties after 10:00 p.m. without much resistance. “After that there were no more problems,” said the police spokesman. (dpa)