today, boston is back in business. and adrian, the dancer we introduced you to, is getting better. she'll have some challenges ahead, no doubt about it. not the least of which, making good on her promise to teach me how to dance. i'm anderson cooper. good evening, everyone. cnn has learned that others may have played a role. also, new details about how the brothers allegedly financed their operation and made one of the bombs. raising the possibility of additional arrests. the paper quoted congressman, chairman of the house intelligence committee, saying he expects additional persons of interest to surface and, perhaps, additional suspects. meantime, for the first time, survivors still in beth israel medical center will no longer have to share a building with this man. the younger suspect, dzhokhar tsarnaev. earlier this morning, he was transferred to the federal medical prison facility about 40 minutes northwest of here. we'll be live at that facility tonight, as well.

also, tonight, as we mentioned a moment ago, we were learning more about one of the pipe bombs found at the scene of last week's shoot out in waterer town. an official calling it similar to one published in a magazine. is simply following a recipe enough or did they have help. susan candiotti is reporting late on it as well as some other new wrinkles in the investigation including to who led authorities to this landfill. she's got new details on the shadowy figure known as misha who steered the suspects towards a new radical strain of islam. mary snow with the biggest, and some say best antiterrorism force anywhere. also, tonight, as always, there are the heroes and the survivors.

today, jeff baumann. you know he's one of the people who, first, identified one of the suspects. i also speak to -- i also speak to heather abbot who had the difficult choice of whether trying to live with a mangled foot or to have her foot amputated. we'll tell you what she chose. we'll begin with susan. susan, what do you know? >> hi, anderson. this information is coming to us from a u.s. law enforcement official who is very close and someone i've been talking with throughout. and this source tells us that the leads to search the landfill for that laptop computer came not only from the suspect himself, the young man who is now hospitalized, but others, who, according to this official, may have had knowledge of its whereabouts or may have everyone played a role in ditching it, getting rid of it, after the bombing.

now, the source says there is also evidence that leads investigators to think that the elder brother, tamerlan, may have been involved in drug dealing. the source would not elaborate on the nature of the evidence we've already been talking about the fact that they have been looking into whether he may have supported himself through drug dealing. but, of of course, if they can find that laptop after it had been ditched, if they can get into that, they can find out things like e-mails and contacts and schedules and instructions. so much other investigation about how this plot may have come together. >> okay, just a couple of quick things. again, we may not know the information. so just say no if we don't. but do we know when this laptop was allegedly ditched? only after the bombing. not precisely when. and that's something that they're still trying to work out. >> also, several days ago, as you mentioned, we've reported that law enforcement had as a

working hypothesis the idea that tamerlan may have been involved in drug dealing. what you're hearing tonight is more firm than that? not just a working hypothesis. >> that's right. that there's actual evidence that they're looking into to follow that thread. more than just a suspicion. when i pressed that individual for what the evidence was, i didn't get very far at this point. >> okay. i understand you also have new information about what the bombs were made of or how they were con struktsed? >> well, belief number one is that both of the brothers had a remote device to blow up each of the two bombs. now, in terms of the ingredients, we know that they're still analyzing a lot of this information. but they do know that one of the pipe bombs that was used in that -- the shootout in watertown, those imp ro vised devices, weren't constructed from elbow pipes. now, elbow pipes, that is one

instruction method, rather, that comes up from time-to-time in "inspire" magazine that is used and promoted by al-qaida to use and how to make a bomb. so that information is also an important part of this investigation. >> what about the suspects level of cooperation? there's been a lot of talk from a lot of different people about how he may have stopped giving investigators information once he was mir an diezed. is that accurate? is that true? >> well, sources are telling me that the investigators and one official used this term, were very thorough. that they got a lot of information from this young man before he was mirandaized and advised his rights. now, while he is not talking substantively, there is still communication. and, of course, over time, anderson, that can change.

it has changed in past investigation, it could change again this time. >> a brother-in-law, in an interview to wolf blitzer a couple days ago, with this character misha, who, allegedly, might have influenced tamerlan taesz toward more radicalism. are authorities actually -- do they buy that? do they think this is real? >> i'm told that they are making, as they call it, making progress in locating this individual. i am told that, in fact, misha has been identified. they know who this person is. they're looking for this person to get a sense of what he may have discussed with the older brother here. >> and i just want to be clear, this is based on your reporting on a single source? more than one?

or just a single source at this point. >> i have a single source on trying to find this individual. but the latest about where he is and that they know who it is, is coming from someone that i've been talking with throughout and has given us very good information throughout the course of this investigation. >> stew san, i appreciate the update. did this have any connection, as far as we know, to this ongoing investigation? >> they've not said that it does and there is no reason to believe there is, but large numbers arrested in an area outside of moscow, not one we've seen in the spotlight in the past in terms of statements from russian security services, but this large number surely will make people think of two

possible reasons for this. perhaps they had been looking to go for this organization for some period of time and want the international political cover of what just happened in boston and the suggestion of a connection here, or maybe this is an attempt to try to preempt criticism they're not doing enough to stamp down on hardcore islamic groups here. as i say, no real specifics as to why they made these arrests but my long time working in russia, i really haven't seen such large numbers in one single swoop, anderson. >> that's a large roundup indeed. what's the latest we know about the whereabouts of the suspect's parents and the investigation by both u.s. and russian authorities? >> reporter: i spoke to the mother this morning. they all are absolutely exhausted. really needing their privacy, talking to us about the pressure of the media and investigators have put upon them in the past. absolutely clear they have left dagestan now. she didn't want to say precisely where they were but key is the health of the father, anzor. he was supposed to be traveling

to the united states right about now, even yesterday, perhaps. that's on hold. he has to get better before he's prepared to get into an airplane. so they're focusing on his treatment. he'll go first. the mother perhaps at a later stage. she's a bit concerned about this outstanding arrest warrant but the funeral for tamerlan once his body is released key, of course, identified earlier, potentially a mosque in cambridge, massachusetts where that could happen, anderson. >> bob, word from congressman mike rogers, head of the house intelligence committee, that he believes there may be more arrests, certainly more persons of interest. he said this is not over. what do you make of that? >> i think you know from what i'm seeing, there almost definitely were accomplices. most of them are probably in dagestan, we'll probably never find out who they are. but with missing evidence, missing computers, the logistics of this, raising money selling drugs, the more you hear, the more i suspect there are accomplices, witting or unwitting. frankly, i don't trust the story given by dzhokhar. self-radicalized, we raised our

own money, we built our own bombs. i talked to a couple interrogators today, al qaeda interrogators. they said look, this is the kind of story all these guys give up. we did it on our own, we got on the internet, we figured out how to make this stuff, we looked at "inspire" magazine but that's what al qaeda tells them to say. i don't know that this occurred in this case, but this is the suspicion out there, people that are not involved in the investigation but from the outside with experience, that's what they're saying. >> nick, you've been now in dagestan in russia for awhile, tracking down this story. it's possible we may never know the specifics of what that elder brother was doing over there six months or who he met with, when he was back in russia last year, correct? >> reporter: absolutely. there are still people trying to piece it together. my conversations with russian security services, they give no comment at all but there's a

suggestion perhaps there is more information ticking around on their side of the fence. we do know this extremist militant was attending the same mosque here, an islamist accused of extremism by authorities. we know they attended the same mosque because his mother told me so. the question here is whether the men actually ever met at all or whether there was some other kind of link, perhaps tamerlan tsarnaev had to militancy here. he was here for six months. we don't know what he did for the first few of them. we know his aunt first saw him in march this year when he came here in january and his father turned up in may and he began helping him refurbish apartments around town, anderson. >> 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 ways, using jihad as a kind of cover for that. it's not that necessarily everybody here would know who he was unless they happened to be involved in tracking the crimes he's been committing while he had been here. certainly we'll never know the 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 have some sort of guidance in a way. susan candiotti reporting based on one single source in law enforcement that one of the bombs, the suspects allegedly used against police during the gun fight last week in watertown, involved an elbow pipe which is similar to what's in an al qaeda magazine and is sort of known as being a device from that al qaeda magazine. i guess it's not kind of the regular way to make this kind of a pipe bomb. does that shake your faith that there were others involved? >> oh, no, not at all. i've made so many of these myself that it's really hard to make the detonators work and electronics. you need practice. if you do this stuff on your own, yes. if you do this as a job, work with your hands, yes, but i don't think neither of these two men did. but on the other hand, there's no explosives expert will tell

you need hands-on practice for a very long time, especially when you're making these things go off under pressure like a gun fight, or you're placing bombs. you just can't count on people -- >> you've actually made these devices? >> yes. >> reporter: well, basically what i can tell you, anderson, is that tsarnaev is in stable condition and doctors at beth israel as well as u.s. marshals decided he was stable enough to be able to be moved to this facility. happened early this morning, we're told just around 5:00 a.m., and immediately upon tsarnaev's arrival, he was put through something that's called the intake screening program. that's a step by step program. first step on that is he goes through a strip search. after that, he has a medical screening. then a psychological screening.

after that, he takes part in something that's called a social intake screening and that's basically where they debrief him on the rules and regulations of what's involved in being at this facility. and then, anderson, we're told they took a dna sample. they took fingerprints. also, they took a photograph. all of that material was then turned over to the fbi and i'm told that entire process took about an hour before he was then transferred to his cell. anderson? >> so is he like in a hospital room? you said he's in a cell? >> reporter: yes. what i'm told is from the spokesperson here, i had two conversations with him today, basically it's a very basic cell. it has a steel door, it has a slot in the front of the door so food can go through it. he has his own sink, his own toilet. it is a single cell, but it's in a restricted part of the facility. this entire facility can hold about 1,000 inmates, but since

he's deemed to be a high risk offender, he's held in a special section that can only hold about 30 or so inmates, so they are under more of a watchful eye of the guards who are there. so he's in a special section of this facility here. >> all right. jason carroll outside the facility, i appreciate your reporting on that. thanks a lot. there's a lot to tell you about throughout this hour. you can follow me on twitter, @andersoncooper. i'll be tweeting tonight, trying to at least during commercial breaks. next, we take you where few outsiders get to go, inside new york's counterterrorism system to look at what might have happened if the bombing suspects had been hatching a plot there instead of here in boston. and later, my visit with the wounded survivor. she's a remarkable young woman. she's recovering, growing stronger every day. she had to be strong to begin with to make the decision she just made. you were presented with a choice about whether or not to try to keep your foot. >> right. >> i can't imagine being

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welcome back. our breaking news tonight, cnn has learned that others may have, said may have, played a role in helping suspect number two, the younger suspect, getting rid of evidence after the bombing. namely, a laptop that investigators think was ditched in a landfill near his college campus after the bombings. now, a federal law enforcement official close to the investigation says their leads to search the dump came not only from the suspect but others who may have had knowledge of its whereabouts or may have played a role in ditching it. susan candiotti is told that

tamerlan may have been involved in drug dealing. susan also reporting tonight that investigators have identified the shadowy figure, misha, who may have helped radicalize the older brother, that's the concrete, now a hypothetical. would things have happened differently if the bombers had been targeting new york? some experts say yes. mary snow will explain why right now. >> reporter: a show of police force that's now a routine drill in new york city in the wake of september 11th. all of it viewed back at police headquarters in a command center very few civilians are ever allowed to see. it's part of an antiterrorism initiative put in place by new york police commissioner ray kelly. >> are you aware of any other police department that has this extensive technology? >> no. no. you know, people understandably don't see themselves threatened as we do. >> reporter: but there are some things in this nerve center we're not allowed to show you, like the electronic board

constantly updating with police alerts about criminal and suspicious activities. some 4,000 cameras around the city stream into this command center. due to security concerns, boston police won't say how many cameras are in their city, but the number is believed to be dwarfed by those in new york. select cameras even send out an automated alarm if a bag is left unattended for several minutes. >> if it looks -- continues to look suspicious, the bomb squad would come in. they would try to x-ray it and if there was still no final determination, they may use a disrupter to -- you know, high-powered water that would disrupt a bomb. >> reporter: times square is of particular concern because millions of people come here every year, and in 2010, it was the target of a failed car bomb attempt. the nypd has stressed video surveillance here but it's also put counterterrorism resources into things you can't see. 1,000 officers working counterterrorism. the unit actively monitoring for potential terrorists.

>> the lead may come in from another law enforcement or intelligence agency so it might come from some other part of the country or somewhere around the world. >> reporter: mitch silver is the former head of the nypd's counterterrorism intelligence unit. in 2007, he wrote a report about the threat of home-grown terrorists, citing the biggest threat coming from ordinary citizens who become radicalized in the west, specifically muslims. it generated controversy. the nypd has also come under criticism for monitoring muslims but the department insists everything done is within a legal framework. silver stresses that keeping tabs on suspicious behavior can potentially track down a lone wolf. he points out that in the case of tamerlan tsarnaev, questions from russia about his travel there as well as being asked to

leave a mosque would have put him on the radar of the nypd. he says there are other personal changes that can be warning signs of radicalization. >> these individuals gave up their old habits. they gave up their old friends. just like we had heard with the tsarnaev brother, tamerlan, he gave up boxing because that was considered a secular activity. >> reporter: silver says social networking sites and chat rooms are often enablers and strengthen the radicalization process. all of it funneling through the nypd's counterterrorism search for a needle in a haystack. >> mary snow, it's really interesting, that idea that there are certain sort of common markers that might indicate someone going down the road of increased radicalism, and these are all things that the nypd tries to look out for, things like causing disruption at a mosque or leaving a mosque or social media networks, things like that. >> reporter: yeah, anderson, and what they're saying is that there have to be certain criteria for an investigation

such as, you know, another country asking questions or travel plans that might be under suspicion but yes, all these things are factors in things they look for, and in monitoring any kind of suspicious activity or just sudden changes in a person's life are all part of -- in what is described as a mosaic really of facts they try to weave together. >> fascinating. mary, appreciate it. whatever the target, so many questions remain as to the motivation. what put the bombing suspects on their path to boylston street and beyond if they are in fact guilty? the surviving suspect claimed they were self-radicalized and there's this. misha, in tamerlan's time in russia and a string of other possibilities to consider. with me now is a former leader in the global islamist movement and now a human rights and democracy activist. great to have you back on the program. do you believe, the nypd clearly believes as mary snow was just reporting that there are certain

markers, a disruptive family event, alienation perhaps from a mosque or religious institution, that they can trace. do you think there are certain commonalities that you see in people as they go down the path toward radical islam? >> well, there are those who are less trained, less well trained and of course, they will be less vigilant in concealing the radicalization that they are going through, and the way in which that will appear will be an example such as tamerlan tsarnaev being kicked out or expelled from the mosque for his extreme views. the traditional religious muslim communities have always rejected this form of extremism and even when i was recruited at the age of 16 to an islamist organization, i not only have been kicked out of a mosque, i have been physically attacked at a mosque for promoting my brand of radical islamism. so that's always been the case. but then there are the really sort of professional trained radical islamists and if you think back to the 9/11 hijackers, for example, some of the stories we heard of them

mixing in pubs, almost even drinking alcohol, they will do whatever it takes to go undetected, because they know that there will be people out there looking for this sort of behavior, and they are the more -- in fact, i would be more worried about those because they would be the ones who would be able to reap much more devastation. that begs the question, what do we do about this type of person who doesn't change his or her behavior and blends in with everybody else, and the report mentioned it accurately. it's like looking for a needle in a haystack. that leaves us only with one other option. that's what i speak about a lot. that is that we have to ask the question what makes angry young muslims at the age of 16, 17, 18 years old or around there, join this form of or this phenomenon in the first place. why do they believe that this is a legitimate vent for any frustrations they may be feeling and why do they no longer join militant communist organizations as they perhaps may have done in the '50s and '60s. why -- >> what made you do it? >> what made me do it?

>> what made you do it at 16? >> it's a combination of wanting a form of resistance ideology, a vent to express grievances, and the zeitgeist of the time in london of the '60s. so the challenge we have is how to make jihadism, radical islamism today as unfashionable as communism has become. that means we need to start promoting counter narratives, we need to start challenging the jihadist ideology, discrediting their propaganda. it means we need to stop promoting alternative ideas, alternative narratives, alternative leaders and symbols. if i ask you a question, anderson, about whether you think of -- if you can think of leaders and symbols that are associated with radical islamism in the middle east today it would be quite easy to think of them. you think of the black flags, you think of leaders such as bin laden, moussaoui. if i say the same questions for leaders and symbols of

democratic activism in the middle east today, we're much harder pressed to think of those leaders and symbols. that tells us something about the power of the radical islamist brand versus the power of the democratic brand. that's what we should really be focusing on. we have been mistargeting the target is not necessarily the individuals but the target must be the ideas and we must be engaging in a counter narrative campaign. >> so how do you build that counter narrative? where are those individuals that you can point to? i guess some you would have pointed to, you know, those who are campaigning for democracy in egypt to overthrow mubarak, although certainly we have seen that not work out as many of them had wanted.

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>> well, we've had two huge it's been humbling to talk to the heroes who saved so many lives here, and to the victims who have shown really extraordinary strength and grace. today, i had the privilege of meeting heather abbott. she's a great person, as you're about to see. the day of the marathon, heather, some of her friends had taken the train up from providence, rhode island. it's a tradition for them, catch a baseball game, watch the marathon runners. heather was hit by the second blast. her left foot and ankle, badly mangled. this picture was taken just days after the attack. that's of course first lady michelle obama visiting heather in the hospital. not long after that visit, heather faced a decision. it's a decision that's hard to imagine, whether or not to keep

her injured foot. we talked earlier today. can you tell me about what you remember from that day? >> yeah. that day, i came up to boston with a group of friends to watch the red sox game, and then go watch the runners close to the finish line at a bar called forum. i remember getting -- when we got to the bar, they were standing at the door taken people's i.d.s. my two girls were in front of me. i was the last one in line. my friends were already inside the bar. and we heard, you know, a loud noise. everybody, i think all of us turned around. i know i saw a lot of smoke. i saw people crying and running, and i immediately thought i was at some sort of terrorist attack. >> that was your initial thought? >> it was. because it reminded me of

something i saw on the september 11th events. so before i could even think of what to do, the second blast happened and i found myself catapulted into the bar on the ground. >> so it actually lifted you up? >> yes. >> and blew you through where the entrance of the bar is? >> yeah. >> wow. >> it did. and i saw one of my friends in front of me and everybody was just running towards the back of the bar. i was outside and i remember thinking like is that the right thing to do, like what if there's another one. but as i started to think about it, i realized i couldn't move. i felt like my foot was on fire. i was in a lot of pain, and i couldn't stand up. so i learned later that i started crawling towards the exit, and i was just saying somebody please help me. people kept running by and a woman luckily heard me say it and came over and tried to give me a hand. she asked another woman to assist her and they both were trying to get me to the back.

>> to the back of the bar? >> to the back of the bar, the exit where the outside was. >> you said it felt like your foot was on fire. did you check it out? >> no. i felt like it was on fire and i thought if i look at it, i'm not going to keep going. it will scare me so much, i won't move. >> you didn't look down? >> no, i didn't look down until i did look at one point when i was being carried down at the ground that i saw a trail of blood. >> what's going through your mind at a time like that? >> i was just hoping i wasn't going to die. and that i would get in the ambulance in time and i also was in excruciating pain that i wanted to end. >> did anybody do a tourniquet at any point? >> they did, yeah. they tied a belt around my leg. my friend tommy gave his belt and they tied it around my leg. i remember that hurting a lot. >> but it's essential to stop the bleeding. >> right. >> they put you in the ambulance?

>> they put me in the ambulance. i remember them putting an iv in me and cutting my clothes. i later learned that my clothes were sent to the fbi. >> because you were so close. >> yes. >> so you get to the hospital. at what point did you learn about your injury? >> i don't think it was until the next day, when i woke up. from the anesthesia. >> what did they say to you when you woke up the next day? >> they said, they told me i had a very serious injury to my foot, that my ankle is broken, all the little bones in my heel were broken, there was some tissue damage, and that they would be doing another surgery to really get in there and take a good look at it and determine whether they would be able to save it or not. >> you were presented with a choice. >> um-hum. >> about whether or not to try to keep your foot. >> right. >> i can't imagine being presented with that choice. >> i couldn't have imagined it until i was faced with it myself.

>> so in the end, you decided to let them take off the foot? >> i did. >> when you make the decision, was it -- what were you feeling? >> to me, there almost wasn't a choice because the way they described my life being with keeping -- with the option of keeping the foot, i couldn't imagine having a life where i couldn't -- i really couldn't do anything for myself. so i really never doubted the decision. >> how do you feel now? >> i feel -- i still feel as though i made the right decision. i think the rehabilitation is going to be difficult. it's going to be a lot of work. but i made progress every day so i feel confident that, you know, eventually i'll get there. >> you've got a great attitude. >> if i didn't, i won't get to where i want to be. >> do you think a lot about that day, or do you prefer not to think about it? >> i prefer not to think about it. i haven't focused a lot of

energy on recounting the events. i think at first i did a couple times, you know, what if i had gone with the first crowd of people that went over to the bar, maybe this wouldn't have happened to me, you know. what if i decided that i wasn't going to go to the game this year. and i think i did that for a little while before i said well, what if anything. that's not what happened. this is what happened. this is what you have to deal with. >> you're dealing with it. >> i am. >> i'm so impressed by the people who rushed in to help people like yourself, who, you know, took off their belts and tied tourniquets and -- >> yeah. that, i think, from this experience, my initial, you know, takeaway has been that people will do things that you would just never expect them to. i mean, the folks who actually got me out there, got me outside on to the ambulance didn't know me, they had no obligation to help me. they were really putting their own lives at risk because they didn't know what was going to

happen next. >> do you think about the people who did this to you? >> i haven't thought about it yet. i just kind of want to stay focused on rehabilitating myself and then maybe i'll learn those details later. >> but at this point that's not important to you. >> no. >> just getting better is? >> just getting better. >> i wish you strength in the days ahead. >> thank you. thank you very much. >> thanks. >> heather abbott. her spirit is so strong. a fund has been set up to help pay for heather's recovery and the prosthetic devices she's going to need for the rest of her life. to make a contribution, go to gofundme.com back slash heather abbott. find that link plus links to other victims' funds on ac360.com. coming up tonight, new information about an unsolved triple murder case back from 2011. one of the victims was a close friend of tamerlan tsarnaev. now investigators are looking closely at the case for any possible connection. mr. goldman loved his family a lot, didn't he dad?

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welcome back. we're live in boston tonight. investigators in massachusetts are taking a new look at an unsolved murder case from back in september of 2011 in light of what they're hearing about the dead bombing suspect, tamerlan tsarnaev. three people were killed back then in september of 2011, including tamerlan's friend and

sparring partner. the district attorney said at the time that it was not a random crime, that the victims and killers appear to have known each other. there were never any arrests and tamerlan wasn't ever interviewed by police. another oddity, marijuana was sprinkled on the dead bodies of the three people. their throats were slit. as we said at the top, there's new evidence that tamerlan may have been dealing drugs. authorities do not know for sure if there is any connection but it does heighten sort of suspicion about the murder case. deborah feyerick investigates. >> reporter: three men nearly beheaded, their throats slit ear to ear. >> there was a girl running out

of the house saying there's blood everywhere. >> reporter: the brutality of the murders didn't add up. certainly not in a town like waltham. something else didn't make sense. the victims who were each killed in different rooms in this house were covered in marijuana. investigators describe it as a symbolic gesture. robbery wasn't a motive because police found thousands of dollars in cash. the theory is that the victims knew their killers. >> we have no evidence of a break in the apartment and we have other indicia that the decedents and the assailants were known to each other. we know there are at least two people who are not in that apartment now that were here earlier. >> reporter: that was 19 months ago but the trail went cold. no arrests, no named suspects. but the attack on the boston marathon revived interest in the case because one of the victims, 25-year-old brendan mass, was close friends with bomb suspect tamerlan tsarnaev. tsarnaev was a golden gloves boxer. his buddy was trained in mixed martial arts. together they would spend hours sparring here at this gym. tsarnaev was a golden gloves boxer. his buddy trained in mixed martial arts. the two friends spent hours sparring together here at this gym. coaches describe tamerlan as confident, full of bravado, a man who hugged his coaches and competitors and who bragged about his young wife and newborn daughter after competing in the 2010 boxing nationals.

a source says tsarnaev was one of the last people known to have seen mess alive and that he was never interviewed by police in connection with the murders. more curious, says the source, tsarnaev did not go to his friend's funeral or memorial service. based on text messages, police believe brendan mess, rafael teken and eric weismann were killed on or around september 11th, exactly ten years after the attacks on the world trade center. four months after the murders, tamerlan left for russia, staying there six months. investigators searched the gym last week, removing boxes. the owner of the gym refused to speak to cnn. brendan's friends and family have continued to push for answers as have those of the other victims. brendan and eric spent time at this diner and were friendly with the owner, who says his son competed in mixed martial arts with dzhokhar tsarnaev. >> i knew tamerlan was involved in boxing and martial arts, and so was brendan. he didn't speak too much about it when i was with him, but he

did speak to my father a lot, and we did try to get my younger brother involved in martial arts, so i mean, it's kind of like a strange link between them. >> deborah joins me now. it's such a bizarre crime. it's rare you have three people whose throats are slit so violently. >> right. the way it was done is fascinating. the reason they believe there was more than one person, because each of the three men were taken into different rooms and they were killed. their heads were pulled back, their throats were slit, so they believed that somebody must have either been holding a gun on them or doing something to keep them at bay. >> then marijuana poured on them? >> all over them. they're looking at links of the younger tsarnaev brother sold drugs, we've heard that from a couple of people, couple of students that spoke to cnn. also, they believe that tamerlan tsarnaev was also perhaps selling drugs to support himself. so now investigators are looking at this with a whole new set of eyes. it's very, very different from the way they were looking at it when it first happened. >> they never interviewed him the first time. >> they never interviewed him.

never interviewed him. why that happened, not clear. but the investigation was kicked up to the massachusetts police that got more resources, more detectives, so they can investigate a little more thoroughly. >> deborah, appreciate it. remarkable. coming up, more heroes and brave survivors we've met here in boston. ke ] summer always moves fast. and out here, we squeeze the most out of every second with leinenkugel's summer shandy. it's crisp, refreshing beer, brewed with the natural flavor of lemonade that's perfect for summer days. and nights. our family's been brewing in chippewa falls for six generations. we craft lots of great beers... but this one says summer. i'm jake and we're the leinenkugels. grab a summer shandy, and join us out here.

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-free is good. -free is very good. [ male announcer ] now get 50% off brake pads and shoes at meineke. on a personal note, it's been a real honor to be in boston these past 11 days or so, we've met so many brave, heroic people from survivors whose determination and optimism have been nothing short of inspirational. this is a city that stands united. a city that will not be defeated. we've met people who have shown us what it means to be boston strong. >> i had this one thought in my head that i need to get there to help these people. and that's all i could focus on at that time. that there had to be something i could do to help these people. and fortunately, you know, after i told one of the police officers that i was a pediatric

resident, they said we need your help. we need you to be there and help us. i they tried to run with me down, to es kort me down, but i sprinted ahead of them. hopefully, at the end, we'll have the ability to run forward and i know i plan on running the marathon again next year. >> we're not going to let something like that stop us. we're not going to let a terrorist act, foreign or domestic. we're americaning. we're going to step up and right back into it. that's them winning if we don't get back into it. you know what i mean? i would hope the marathon goes on next year and all the events future from here in boston and go on. we're not going to let them win. as simple as that. >> this city has been struck and the people have been struck, people are holding together and people are going to get through this together. as community. maybe this will change us

forever. evil hit, but good rises. >> i'm proud to live in a city of heroes with all of the police, the fire, the health care, the civilians, everybody making what happened, the miracle that happened, as far as saving so many. >> we just happen today be in a really bad situation. but you were there. you were put there for a reason and you know, the guts or whatever you want to call it, to run in there and make a difference. >> i don't want that to be the end. i'm only 32. i don't want this to be the end. so whether it's, you know, running the marathon or walking the marathon or crawling the marathon and being the last one across, i'm okay with that. i didn't say i'd win it. but i'm defiant and i want to come out stronger. >> that's what boston strong is all about. we'll be right back. hey aleigh.

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that does it for this edition of "360." parts unknown starts now. for korean americans, according to the stereotype, anyway, it used to be that you grew up to be a doctor, a lawyer, an engineer. there were a specific set of rules and expectations. are you asking me tore in a porno? >> thanks to some remarkably bad koreans, things are starting to change. >> i went to one years of law school and walked out. >> so you're a bad korean. >> any advice to someone about to marry a korean woman? the answer -- don't do it. ♪