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New Developments in Boston Marathon Tragedy Reveal Bomb Design

FBI analysis of bombs used during marathon had toy car remotes as triggers.
04/27/2013

Transcript for New Developments in Boston Marathon Tragedy Reveal Bomb Design

We begin with breaking news tonight. Authorities here in washington following the fast moving developments in the case of the boston bombers. This evening a major new development. Abc news learned... See More
This transcript has been automatically generated and may not be 100% accurate.
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