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Meanwhile, investigators are trying to determine if there's a link between the other suspected bomber, tamerlan tsarnaev, and this man, william plotnikov, a canadian boxer turned jihadist. he was killed last year in a shootout with russian troops. that happened in dagestan while tamerlan tsarnaev was in the region. the investigation of the tsarnaev brothers has put southern russia on the map for a lot of people. investigators right now taking a hard look at dagestan and chechnya. a disturbing trend in that part of the world. the rise of women suicide bombers. known as black wid dowidows. nic r...

Tsarnaev left russia just a couple of days after the death of william plotnikov in an ambush by russian special forces. as you say, there's no key evidence suggesting there was a link or contact between them. the parallels are just there. and they're glaring. that's why investigators are looking at it, wolf. >> as you know, the russians alerted the u.s. about tamerlan tsarnaev back, what, 2011. earlier today president obama asked about how well the russians are cooperating in the bombing investigation. in his words, he said the russians have been very cooperative with us since the bombing, the...

Trying to determine if there's a link between tamerlan and this man, william plotnikov, a canadian boxer turned jihadist killed a year ago in a shoot-out with russian troops. firefight happened in the same region tamerlan was visiting. he returned to the u.s. quickly thereafter. we have reporters covering all angles of the investigation. and we're staying on top of this story. meanwhile, a defiant president obama says the u.s. won't be intimidated by bombings in boston. in a news conference over at the white house just a little while ago the president was asked whether people should be afraid ...

Investigators want to know whether a canadian boxer turns jihadist may have influenced the boston bombing suspect, tamerlan tsarnaev. william plotnikov dies in a firefight with russian forces in dagestan last july. plotnikov was born in russia, but his family moved to canada when he was a teenager. nick paton walsh joining us live from moscow. nick, explain who this guy william plotnikov was and the possible links, possible links, to tamerlan tsarnaev. >> reporter: well, investigators are looking to see if there's link because of the sheer parallel between william plotnikov, a north american c...