Officials say Boston suspect had no firearm when barrage of bullets hit hiding place
Authorities said they were desperate to capture Dzhokhar Tsarnaev so he could be questioned. The FBI , however, declined to discuss what triggered the gunfire.
Other law enforcement officials said the shooting may have been prompted by the chaos of the moment and some action that led the officers present to believe Tsarnaev had fired a weapon or was about to detonate explosives.
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