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erin dnt mattingly boston bombers tsarnaev christmas lights_00015712.jpg

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    Watch a bomb like the Tsarnaevs' explode

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Watch a bomb like the Tsarnaevs' explode

CNN's David Mattingly looks at how the Tsarnaev brothers built the explosives they used in the Boston Marathon bombings.

Watch a bomb like the Tsarnaevs' explode

CNN's David Mattingly looks at how the Tsarnaev brothers built the explosives they used in the Boston Marathon bombings.