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Virgin London Marathon 2013

LONDON, ENGLAND - APRIL 21: Runners stand in a silent tribute to the victims of the Boston Marathon bombings before the start of the London Marathon from Greenwich Park on April 21, 2013 in London, England. Thousands of runners are taking part - with some wearing black ribbons as a mark of respect to the Boston victims. Extra police are on duty as an estimated 500,000 people line the streets of the capital. (Photo by Peter Macdiarmid/Getty Images)