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A raver dances during the 19th annual techno Street Parade, on Aug. 14, 2010 in Zurich. The annual techno music event is expected to attract hundreds of thousands of ravers. The event was interrupted at 5:00 p.m. for a minute of silence to pay tribute to the 21 killed people in a stampede at the Love Parade on July 24, 2010 in Duisburg, Germany