This image from a surveillance video helped investigators identify Tamerlan Tsarnaev (in black cap) and his brother, Dzhokhar (in white cap), as the main suspects in the Boston Marathon bombings. FBI.gov hide caption

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From the NPR Newscast: Dina Temple-Raston reports

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Tamerlan Tsarnaev, as seen in a video taken on April 15 near the finish line of the Boston Marathon. FBI.gov hide caption

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