Dzhokhar Tsarnaev and Tamerlan Tsarnaev in photos

PHOTOS of Dzhokhar Tsarnaev, 19, and his older brother Tamerlan Tsarnaev, 26. Are they the Boston Marathon bombers? Tamerlan is dead. He was killed by police in a chase after a MIT campus policeman was shot dead. Dzokhar is on the run. He is naturalised US citizen, who came to the country from Chechnya.

Boston Marathon Explosions

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during a news conference talking about the investigation of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)