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Lead Boston Marathon piecing together evidence_00013720.jpg
Lead Boston Marathon piecing together evidence_00013720.jpg

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    Connecting evidence in Boston bombings

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Connecting evidence in Boston bombings

Reconstructing the Boston bombs could be key to the manhunt. CNN's Tom Foreman walks us through the police work.

Connecting evidence in Boston bombings

Reconstructing the Boston bombs could be key to the manhunt. CNN's Tom Foreman walks us through the police work.