Boston Probe: What's Next | NBC4 Washington
[NATL]Terror in Boston: Boston Marathon Explosions

NATL

Three Dead, Hundreds Injured After Explosions Near Marathon Finish

Boston Probe: What's Next

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    Dzokhar Tsarnaev, the surviving Boston bombing suspect, is answering investigators in writing from his hospital bed. As questioning begins, some raise questions to FBI inquiries of the older Tsarnaev's possible ties to radical groups.