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Boston Marathon Explosions: Inside the Investigation

ABC News? Pierre Thomas breaks down the latest from law enforcement.
04/16/2013

Transcript for Boston Marathon Explosions: Inside the Investigation

It's been more than eleven years since the 9/11 attack shocked this country into the 21 century and since then there have been more attempted attacks the shoe bomber the underwear bomber the Times... See More
This transcript has been automatically generated and may not be 100% accurate.
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