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Boston Bombing Warning Signs

Were there clues that could have prevented the Boston Marathon bombings?
01:31 | 05/09/2013

Transcript for Boston Bombing Warning Signs

Next, we turn now to news from the investigation of those bombs at the boston marathon, just three and a half ago. Were there clues that could have been pieced together before it happened? That... See More
This transcript has been automatically generated and may not be 100% accurate.
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