<p>A Shell gas station, foreground, where a carjack victim escaped from Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev, after they allegedly shot and killed MIT police officer Sean Collier, sits across from an apartment building that was home to Stephen Silva, in Cambridge, Mass.</p>
July 24, 2014
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July 24, 2014 9 p.m.
Man tied to gun said 'bomber' his friend
Silva arrested on heroin traficking charges
BOSTON - Details emerged Wednesday on another friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev.