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Professor caplan, always a pleasure to have you on. thank you very much. >> thanks, john. some rioters have showed no remorse while others do have regrets. we will take at the lessons learned, or in some cases, not learned. the fbi conducted more than 900 interviews, combed through 39,000 videos, and that was just for the d.c. pipe bomber. where that search stands now. >> such a good question. >> it really is. the livingng room slash yoga shanti slash regional office slash... and this is the...

Determine, if anyone else at any point was involved. but you have to think, brian, of how those moments went by last night in the middle of the night in the dark when he was fleeing and he jump into a boat. >> reporter: thats right. and you know, i was talking to my team as we were kind of making our way away from the scene. theres a very good chance that he could have been in that boat for much of the day because when they were going through the houses in that neighborhood, they were doing a th...