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Full extent perhaps of what she knows about what her sons were doing, if she had any idea they were up to any misdeeds at all. it's going to be absolutely key to try and precisely prove whether there was any genuine contact between tamerlan tsarnaev and this man. so many of their lives overlapped, the places they prayed, the skills tamerlan tsarnaev could have been shown. we don't ever know if those two pieces actually ever connected. perhaps the russian security services do, anderson. >> as you said, bob, you were skeptical of this whole idea they built these devices on their own or didn't ha...

>> nick, the other day when you interviewed the mother, you asked her about the extremist who was killed in dagestan by russian authorities. was i correct, because when i heard it was sort of muffled on my earpiece, she claimed not to know who this guy was? if that's in fact what she said, do you buy that, that someone in dagestan who is devoutly religious would not know who this well-known extremist is in dagestan? >> reporter: i have no reason to think she was necessarily deceiving me. the man himself kept a low profile in that i think police accused him of running a criminal network in many...