Detailed text transcripts for TV channel - KGO - 20130423:09:01:00
Primary motivating force for him to become radicalized. why did they end up doing what they did on that day? >> reporter: much of the investigation is still focused on his deceased 26-year-old brother tamerlan. examining his life, his recent trip back to russia, as some question if the fbi did enough to monitor him after they questioned him two years ago. >> they investigated it thoroughly and did not find terrorist activity domestic or foreign. >> reporter: the street where two bombs killed thr...
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