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Photo of Tamerlan Tsarnaev at 2010 New England Golden Gloves 2010/ still at large: Dzhokar Tsarnaev, 19
Photo of Tamerlan Tsarnaev at 2010 New England Golden Gloves 2010/ still at large: Dzhokar Tsarnaev, 19

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    Did Boston Marathon bombers act alone?

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Did Boston Marathon bombers act alone?

Prosecutors argue the bombs used were too "sophisticated" for the Tsarnaev brothers to have built on their own.

Did Boston Marathon bombers act alone?

Prosecutors argue the bombs used were too "sophisticated" for the Tsarnaev brothers to have built on their own.