Boston : Authorities ask federal and state agents to help find the men seen in photos . NEW : The men are of ` ` high interest '' in the probe into the Boston Marathon blasts . They have pleaded for the public 's help in providing additional leads and images . NEW : One of the men is seen in photos carrying a black backpack , an official says . Two people were killed and about 180 injured when 2 bombs went off near the finish line .
Boston : Authorities ask federal and state agents to help find the men seen in photos . NEW : The men are of ` ` high interest '' in the probe into the Boston Marathon blasts . NEW : One of the men is seen in photos carrying a black backpack , an official says . Two people were killed and about 180 injured when 2 bombs went off near the finish line .