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London marathon kicks off with a moment of silence
Runners observe a moment of silence before the start of the London Marathon in Greenwich, southeast London, on April 21.Luke Macgregor / Reuters
Undaunted by the Boston Marathon bombings, big crowds lined the route of the London Marathon on Sunday to cheer on some 36,000 runners who paid their respects to the Boston victims by wearing black ribbons and holding a 30-second silence before the start.