Boston Probe: What's Next | NBC Bay Area
Terror in Boston: Boston Marathon Explosions

Terror in Boston: Boston Marathon Explosions

Three Dead, Hundreds Injured After Explosions Near Marathon Finish

Boston Probe: What's Next

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.

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