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Boston Marathon: What Was the Bomb?

Officials recover part of a "pressure cooker" IED.
03:23 | 04/17/2013

Transcript for Boston Marathon: What Was the Bomb?

Police have received 2,000 tips in the boston bombings, that's the scene right there. Investigators combing through it inch by inch. The boston police commissioner says he's never seen a more complex... See More
This transcript has been automatically generated and may not be 100% accurate.
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