Maratona e Bostonit

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The second wave of runners make their way down Main Street during the 118th running of the Boston Marathon in Hopkinton, Mass., April 21, 2014.

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Boston police officers, part of the K-9 unit, patrol Boylston Street near the finish line before the start of the 2014 Boston Marathon, Boston, Mass., April 21, 2014.

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Till T. Teuber of Hamburg, Germany, prepares himself before the 118th Boston Marathon, in Boston, Mass, April 21, 2014.

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Elite men runners leave the start line in the 118th running of the Boston Marathon, in Hopkinton, Mass., April 21, 2014.