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New Clues May Provide Information on Boston Marathon Bombing

Searching for answers as experts analyze shrapnel and fragments left over from explosion.
01:49 | 04/17/2013

Transcript for New Clues May Provide Information on Boston Marathon Bombing

-- shows us just how far the blast from the bombs travel. -- The killer bombs likely contain less than two pounds of common black powder explosive. Says one of the nation's leading IED experts even... See More
This transcript has been automatically generated and may not be 100% accurate.
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