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 robertson reports from dagestan. reporter: in dagestan s capital last may, an inferno, moments earlier, a female suicide bomber known here as a black widow, detonated a bomb at a police checkpoint.
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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 of attending large gatherings after the attack at the boston marathon, and he said, absolutely not. we re not going to stop living our lives because warped individuals try to intimidate us. we re going to do what we do which is go to work, raise our kids, go to ball games, run in