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These two and communications by these two. we were told and we've told you earlier in the hour that a source at the national counter terrorism center is concerned that these two may have had help, that they believe they must have had some help or training and perhaps, quote, training overseas, and we are told that they are looking into exactly who that would have been. we also know again, according to this source, connected to the national counterterrorism center that they know these men posted certain things on line and espoused sympathy for al-qaeda ideology. what we don't know is whether th...

Enforcement and find out if there coconspirators and accomplices. >> nbc news terrorism expert, to that point, tell us about how you prioritize this information that you are looking for in terms of what you want to do which is avoid the immediate threat and shut down. there will be times to do in the future sort of the psychological profile and those things. how do you prioritize at this point for the safety and security of the people in that area around boston? >> it's very much like what you described. this is unprecedented securing of an enormous area. that's because although the police and...

West. steve everson has been with us all week. he's a terrorism expert, and he has been looking into the on line postings that we believe belong to these two men. steve, what can you tell us? >> well, one of the brothers, actually, both brothers had youtube channels in the united states. they also had youtube channels in russia, but the ones in the united states we examined about half of the 22 videos they posted. some of them are in english, some of them are in russian, most of them are in ai arabic. it's clear to me based on the videos which feature bin laden, which feature exhortations to k...

Stone. a number of reasons why they think he is here, but also, of course, a strong possibility he's not, that he managed to escape, managed to get out of this area. >> katy tur, thank you for your reporting. let's bring in michael leiter of, an nbc news terrorism expert. good afternoon, mike. what do you make of these possible connections between the two brothers and chechnyan terrorists? >> what we really know their ethnic is chechen. the one brother has traveled to chechnya. we really, really can't go down the road yet of assuming, even assessing is likely, that they were, in fact, linked t...

Was put together. so it's a very thorough attempt to get around the spots where these explosions went off and gather as much information as they can of all sorts of materials. >> nbc's pete williams, thanks so much. joining us now in new york, michael leiter, an nbc news terrorism expert and former director of the national counterterrorism center. with us from boston, kevin cullen, columnist with "the boston globe." michael, you and i were just talking about, just with the volume of forensic evidence, how are they making decisions about what leads to pursue and sort of what to do with all th...