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Boston Terror Attack and Lockdown: A Timeline

April 19, 2013

2013 Boston Marathon

On a clear spring day, the first wave of runners starts the 117th running of the Boston Marathon in Hopkinton, Massachusetts April 15, 2013. The event is in celebration of Patriot's Day, which is officially on April 19th.

<p>On a clear spring day, the first wave of runners starts the 117th running of the Boston Marathon in Hopkinton, Massachusetts April 15, 2013. The event is in celebration of Patriot's Day, which is officially on April 19th.</p>next

REUTERS/Dominick Reuter

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