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The Race Against the Clock

Experts try to determine where the bombs that went off at the Boston Marathon originated.
01:27 | 04/16/2013

Transcript for The Race Against the Clock

Martha Raddatz -- on the phone with sources today just back from Boston Martha. So presumably they are looking at surveillance tapes in this area what do you know about that when you heard Brian say... See More
This transcript has been automatically generated and may not be 100% accurate.
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