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The Hunt for the Boston Marathon Bomber

Former counterterrorism head Dick Clarke discusses the marathon bombing investigation.
02:24 | 04/17/2013

Transcript for The Hunt for the Boston Marathon Bomber

More from richard clarke, the head of counterterrorism for presidents clinton and bush. Now an abc news consultant. Let's go through some of the clues. The photo showing the bag right by the mailbox... See More
This transcript has been automatically generated and may not be 100% accurate.
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