Boston: Up and Running

By Chris Pollone

Published 04/21 2014 11:31AM

Updated 04/21 2014 11:38AM

(NBC News)  The 118th Boston Marathon is under way.

The shadow of last year's terrorist attack hung over the race, which began with a moment of silence honoring those killed and wounded by twin bomb blasts near the finish line.

3,500 law enforcement officers and more than 100 security cameras will cover the race route.

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