Security was tight for the London Marathon on Sunday as thousands of runners paid solemn tribute to the victims of the deadly bomb attacks at the Boston Marathon barely a week ago.
A handler works with an explosive-detecting dog on The Mall on April 20, 2013. The London Marathon got under way on Sunday after marking a 30-second period of silence to remember the victims of the Boston Marathon attacks.
A sombre 30-second period of silence was observed ahead of the start of the elite men's and mass races at 10:00 (0900 GMT) in Greenwich Park on the south bank of the River Thames.
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