Tamerlan and Dzhokhar A. Tsarnaev

Tamerlan and Dzhokhar A. Tsarnaev

Bob Leonard/AP Photo

This April 15, 2013 photo provided by Bob Leonard shows Dzhokar Tsarnaev, second from left, and Tamerlan Tsarnaev, in the black cap. This image was taken approximately 10-20 minutes before the blast.