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The Moment of Terror at the Boston Marathon

Runners and spectators describe the sheer horror and chaos when the blasts went off.
02:35 | 04/16/2013

Transcript for The Moment of Terror at the Boston Marathon

-- images of the city -- erupted half eaten sandwiches abandoned on the street where the bombs went off. As tonight ABC's Dan Harris -- new insight taking us behind those images we all watch together... See More
This transcript has been automatically generated and may not be 100% accurate.
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