Demi Clark of North Carolina was crossing the finish line as the first of two explosions went off at the Boston marathon. She described to CBSNews.com's Brian Montopoli what the scene was like in the ... more 
Demi Clark of North Carolina was crossing the finish line as the first of two explosions went off at the Boston marathon. She described to CBSNews.com's Brian Montopoli what the scene was like in the moments after the blasts. less 
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Mon, Apr 15, 2013 9:00 PM EDT