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tsr intv lawrence examining photos boston marathon_00010525.jpg
tsr intv lawrence examining photos boston marathon_00010525.jpg

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    Examining photo evidence from bomb site

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Examining photo evidence from bomb site

CNN's Chris Lawrence takes a look at how investigators are piecing together clues in the Boston Marathon bombings.

Examining photo evidence from bomb site

CNN's Chris Lawrence takes a look at how investigators are piecing together clues in the Boston Marathon bombings.