when i have buddies from my unit or former special operations unit, that's my advice. you need to find something that your heart's in. that's the way we've been in our whole lives. >> your book "touching the dragon," thank you. the cnn associate report "a double life: the spy inside al qaeda" hosted by christiane amanpour starts now. >> announcer: the following is a cnn special report. after al qaeda declared war on the west, this man was a rare thing, a western spy on the inside. >> i sad down next to osama bin laden. >> undercover and foiling plans

for chemical weapons attacks. >> attacks small and closed spaces, cinemas, night clubs and entertainment venue. >> a scheme to place pois nicot poison on cars. revealing an attack on the new york city subway system. >> you're talking about a simple device that could have killed dozens or hundreds of people. >> then someone blew his cover and al qaeda was on to him. >> the leakiness of washington. >> since then i've been living under a death sentence. >> tonight, a double life, the spy insi spy inside al qaeda. this is not just a retelling of the boldest act of terror the world has ever known. >> why are they jumping?

>> oh, god! oh, god! >> reporter: this is the story of how one man joined al qaeda, before turning on it and fighting to dismantle it, risking his life, becoming a spy on the inside. months before the 9/11 attacks, this jihadi-turned-spy told british intelligence about a disturbing conversation. >> i was summoned to see osama bin laden's deputy. >> reporter: what did he say to you? >> something big is going to happen. he told me they expect the americans to be in afghanistan. >> reporter: he said the british immediately shared this information with their u.s. counterpart. his name is aimen dean, living with and spying on al qaeda for

years. the terror group was unaware that their once-loyal foot soldier had switched sides. how terrifying it must be to stay in and try to be on the one hand a part it have and the other hand to be giving information. >> i imagine absolutely it's terrifying and you must wonder have i made a mistake? how will i be tomorrow? >> if your cover is blown while you are there, no help is coming. >> reporter: dean's extraordinary story is revealed in this book, "nine lives, my time as the west's top spy inside al qaeda." he wrote it with cnn terrorism analyst paul crouickshank. >> why have you decided to tell your story? >> i thought the time right now. the time of the narrative is the extremists. they're shouting loud. i think it's time to shout back

louder. >> reporter: but going public comes with great risks because ten years ago dean's former al qaeda comrades discovered his betrayal and made it clear they want him dead. and do you not worry that there are still people out there from your old life, from your old world who want to kill you? >> if they are willing to risk their lives for a cause that is diluted and wrong and mistaken, then it is my belief that we should do the same. >> reporter: the story starts when dean was a teen-ager and shared their cause and thought he was answering that call in bosnia. it was his generation's afghanistan when the mujahideen defeated the soviet union in the 1980s. now it's the 1990s and the former yugoslavia explodes into brutal conflict, and in bosnia muslims were massacred.

it was ethnic cleansing and genocide, europe's first since world war ii, and graphic videos of the bloodshed were being viewed by i don't think muslim boys in saudi arabia, boys like aimen dean. >> we were always shown footage of the bosnian genocide and how that was a crusade against islam and how this is a turning point where basically christianity is at war with islam. >> reporter: this is how dean became radicalized, convinced that it was his duty to go to bosnia to protect muslims and die as a martyr. he was just 16 years old. >> i remember arriving there in october 1994, i don't know if you were there at that time or not. >> reporter: i was. >> small world. >> reporter: by 1994, i had already been covering the balkan

wars for years. the bosnian peace process appears to be going nowhere. as a reporter, i witnessed some of the worst of humanity. as a jihadi, so did aimen dean, who fought on the front lines. in one battle his job was helping the wounded and he almost became a casualty himself. >> i heard the cries of an arab individual. so i was going to get him out of one of the bunker and with without knowing it basically, i was pulling the wires that were linked to land mines. >> reporter: he says there were at least four land mines attached to the wire wrapped around his legs, yet none detonated. >> at that time i wasn't grateful. i thought i was denied my shot at martyrdom. i wanted to be a martyr. >> reporter: dean was a true

believer. but he would be tested when fellow fighter decided to murder their prisoners. >> young people from saudi arabia, from tunisia, nigeria, taking their axes and big knives and basically beheading serbian soldiers. >> reporter: so they killed them in cold blood? >> yes. >> reporter: and what did you think about that? >> at the time i remember i saw the ugliness of the bosnian war and what it did to my comrades, what it did to my friends. we came to bosnia as, you know, noble volunteers trying to save people from genocide, and here we are engaged in an orgy of blood first thirsty butchery. i was told would you like to take part it in? i said no. >> reporter: you said bosnia taught you the horror of war but

yet you didn't go home after bosnia, you went to afghanistan. yes. >> reporter: they met as the war in bosnia was winding down. >> i was ready to believe whatever he was going to say about this conflict being a stepping stone against a greater conflict from the ills of american-led globalization. >> reporter: soon after arriving in afghanistan, dean met the al qaeda leader, osama bin laden. so what did osama bin laden say? what was the first encounter like? >> he was talking about liberating jerusalem, liberating the arab peninsula, liberating iraq, seyria, lebanon and the

calliphate caliphate. >> reporter: what changed? >> a lot changed in a year because when you spend a year in the camps in afghanistan, i think the propaganda you're fed, the indoctrination you're subjected to will change your mind. >> reporter: so you were brainwashed? >> absolutely. >> reporter: the next time he met bin laden, dean was ready to swear an oath of loyalty. >> i sat down next to osama bin laden and he was smiling and he emphasized the importance of this pledge of allegiance and the importance of what i'm supposed to be joining. it's bigger than us. it's going to span generations. so it is basically an eternal struggle. >> reporter: do you remember the words you said? >> yes, the process is simple. it's a handshake and during the handshake you swear that you will fight longside him against

whoever he fights and to make peace alongside them with whoever he makes peace with, to obey him in times of ease and in times of hardship, and that god is my witness. and that's it. >> reporter: osama bin laden was not yet the world's most wanted man. phil mudd is a former depp testify director of the cia counterterrorism center. >> i think there is someone in the intelligence community who knew al qaeda was slowly emerging but i don't remember people looking at him and saying this guy is going to become the center of the universe for the united states intelligence over the next five to ten years. no way. >> reporter: meanwhile al qaeda was working to develop weapons of mass destruction. aimen dean was assigned to work in its chemical weapons lab. >> they wanted to enable people, ordinary people, to purchase every day chemicals and to turn them into chemical weapons.

it's all about simplifying the art of death, let's put it this way. and that's exactly what they achieved. >> reporter: al qaeda's chemical weapons facilities were a dangerous and well-kept seek kress. >> we had modest knowledge but i have to tell you, i think our understanding of what they were up to was minimal. >> reporter: next -- >> if they are able to twist fate in this way, what will they do next? >> reporter: no longer believing in the cause, dean becomes a british spy inside al qaeda. >> you have to atone for your sins. you have to dismantle what you helped to build. you have to do the right thing.

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smart neighborhoods running on a microgrid. a stadium powered with solar. a hospital that doesn't lose power. amazing. i like it. never gonna happen. ♪ >> reporter: august 7, 1998, truck bombs explode outside u.s. embassies in kenya and tanzania, killing 224 people, including 12 americans. this is the opening salvo of al qaeda's campaign of global terror. in afghanistan, al qaeda operative aimen dean learns of

the attacks when he hearse t th sound of celebration. >> we started to hear a lot of fire basically, a lot of shooting in the air taking place. so we immediately rushed out of the prayer hall and saying what's happening? and they said rejoice, everyone. of course we joined in the celebration, we were shouting in the air, we're very happy that bin laden at that time delivered on his promise to deliver a blow against the americans. >> reporter: but in the following days as dean learns more about the attacks, that most of the victims were kenyan civilians, his celebration turns to concern. >> it's the justification for that which actually scared me as much as the act itself, because i fet thlt that if they are abl twist fate in this way, what will they do next? then we are going into the slip rich slope and slippery slope because it is so full of blood,

you slip on it. >> reporter: the united states retaliates, launching cruise missiles into al qaeda camps in afghanistan. >> our target was terror. our mission was clear. >> reporter: they missed osama bin laden. were you around when that happened? >> indeed yes. in one of the camps i was there. in the tent where i was, there was one death and one serious injury. >> reporter: dean was unharmed. once again, he had defied death, but this time he wasn't disappointed because, he says, he was no longer dreaming of martyrdom. would you say that the embassy bombings was the beginning of the end of your infatuation with al qaeda? >> yes. i don't like the direction. i almost got killed. and the direction is going to get thousands -- tens of thousands, hundreds of thousands kids over the next decade or two or three. so my thoughts started to linger

on leaving. and i started to think about going back to saudi arabia or to go and live in any of the neighboring countries, like qatar or kuwait, go into university and become a vhistor teacher. that was the plan. what a naive plan it was. >> reporter: why naive? >> because once you're in the game, you're never going to get out. >> reporter: but dean was determined to tie. in 1998 he put into motion his plan to leave afghanistan and. o previously he had been tweeted to malaria and typhoid. this would be a follow-up appointment to make sure he was recovering well. >> i boarded the flight, i arrived in qatar and i thought that's it, i'm going to mook inquiries about how to enroll in

university and that's. >> reporter: but a call he made to a terror operative put him on the screen of security investigators. he was taken and questioned about his ties to al qaeda. >> was kept in that building for nine days but i was well treated. >> reporter: well treated because he quickly decided his best option was to cooperate and tell them whatever they wanted to know. >> in the end they told me we admire the fact that you want to leave and that you have supplied us with considerable intelligence on what is happening. >> reporter: dean says the qataris told him they could not keep him and gave him 30 minutes to decide if he wanted to be sent to france, the united states or britain. >> i decided basically to work with the u.k. intelligence services.

>> bond, james bond. >> reporter: james bond movies he had seen made him feel the british were the most professional. the qataris put him on a plane to london. >> as soon as i landed, they greeted me in arabic. they were very enthusiastic and they just guided me into a room in the airport. >> reporter: after several hours of being interviewed, dean gave the agents a leather pouch. >> and that pouch had discs basically, floppy discs, containing al qaeda's explosives, chemical weapons, biological weapons and poisons and training manuals. >> reporter: how did you have that? >> i had them at the time. basically i was working with the al qaeda's master bomb maker on developing these and i was trained by him for many, many months. so i had all of these notes with

me. so i give it to them and i said basically that this is the first gift to show that my intentions are honorable. i remember it was december 16. so for them basically it was christmas early. >> reporter: for the british being handed al qaeda training manuals was a huge intelligence coupe. >> certainly with al qaeda in afghanistan, there was concern about them developing poison gasses. >> reporter: dean would do more than cooperate. he would make the life changing decision to become a british spy inside colliding, working for the intelligence agents mi-5 and mi-6. >> you have to dismantle what you built. >> so a cover story was that he was sent on for medical

treatment. so you told your buddies that you were sent to the hospital? >> indeed. because they sent me there because of an urgent medical procedure that had to be done. >> reporter: and they bought it? >> indeed. >> reporter: and they calculated that would make him more valuable to this many but he was busy spilling their secrets. >> it took me six months telling about all the networks, pakistan, after -- afghanistan. it was building a mate trick ri these groups and individual and building an accurate picture of their camp locations,

fund-raising capabilities and military capabilities spread around the world. >> reporter: british intelligent wanted him to find out more in london. he became known in radical circles. >> 1999, how important was london as a wanna-be jihadi location? >> we used to joke and call it -- >> reporter: that bad? >> it was that bad, yeah. >> reporter: at the time richard bairn was the high-ranking official. in the time between the bombing and 9/11, how much chatter was there? how much did you perceive in the u.k. intelligence? >> there was quite a lot of people in london who were supportive of al qaeda. they've stayed on the right side of the law but i think at that time policy makers were not

particularly interested in the flow of resources and information collection was relatively limited. >> reporter: that's where aimen dean came in. he would live around london and report on their activities. but each time he met his handlers, they had to make sure he wasn't being followed. >> the first thing is they would tell me to go to a particular phone booth, outside of a tube station somewhere or close to it. then when i call the number, they will give me a route to follow. and at the end of the route there is another phone booth. i pick up the phone, i dial the number and then they will tell me either go home, which means you've been followed. i never been followed. so they would tell me, okay, proceed to this hotel or that hotel or that restaurant. >> reporter: in june 1999, dean

followed that protocol going from phone booth to phone booth. eventually he was instructed to go to the washington may fair hotel. he walked in. the agents were waiting. they had an important question for him and it would be a game changer. >> would you be willing to go back to afghanistan? and i can tell that they were preparing for a long conversation and that they have to really work hard to persuade me and they were shocked when i said, oh yeah, that's fine. they were saying are you sure? i said yeah, i know it's risky but yes, i'm willing to go back to afghanistan, that's fine. >> reporter: coming up, a secret agent inside al qaeda. is the risk worth the reward? >> that risk is not only that they'll be beat up. that risk is that they'll be killed.

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>> reporter: in the summer of

1999, aimen dean embarks on a mission that might be his last -- returning to the al qaeda camps in afghanistan, no longer a jihadi but now a spy for british intelligence. >> i was talking a bus with one of my friends and i remember thinking about i'm going to meet my comrades but this time not as a friend but i'm going to see them as targets. >> reporter: his ability to live among former comrades and report on their activities would be rare and invaluable. >> you cannot replace human intelligence and the ability to get next to somebody when they are suspicious that you're trying to spy on them and they'll only talk to somebody they view as a friend. you can't replace it. >> reporter: and british intelligence would not be able to replace a secret agent like dean if he were caught.

>> i thought the only way i could survive is to basically suppress the spy in me and to basically let the jihadist in me be the dominant personality and to keep saying always i'm a jihadist, i'm a jihadist, damn the west, in order to basically make sure i do not slip, i do not make a mistake. >> reporter: dean knew any misstep could be fatal. >> if your cover is blown while you are there, no help is coming. afghanistan is a black hole as far as intelligence operations were concerned. it's just a place where you can't meet handlers, you can't transmit information. you are on your own. once you're going in, you're lost. once you're coming out, you're born again. if my cover is compromised, then i would have faced a tribunal and death. >> reporter: aimen dean did face death soon after his arrival in afghanist afghanistan, not at the hands of al qaeda but while fighting

alongside its ally, the taliban. >> one british egyptian, a dear friend of mine actually, because we came under ambush on the northern alliance we had to turn back. he was shot in the head right next to me. i had to see him there completely lifeless and bleeding. and i was thinking this is really serious, it could have been me. >> reporter: it really crystallized the danger you were putting yourself into. >> absolutely. >> reporter: away from the front line, dean was expected to continue his work on al qaeda's wmd program with mast eer bomb maker al masri. describe some of the experiments you took part in. >> they experimented mostly on rabbits, it made 80% of the test subjects. they did experiments on dogs. if you thought rabbits were

silent creatures, wait until you hear the experiment and you hear them shriek. i ended up seeing rabbits chasing me in my dreams throughout my stay in that camp. can you tell basically that it had an impact. >> reporter: and what, they just died? they shrieked and died? >> of course. bleeding from their mouths and from their noses. it was awful, it was disgusting, but nonetheless, because of my undercover assignment, you can't basically say, no, don't do it, please, i don't want to take part in it. you have to witness that. >> reporter: in late 1999, all of that experimentation culminated in a frightening success that could threaten an untold number of innocent lives. >> reporter: he was able in the end to come up with a bre breakthrough where he created a simple and easy-to-make device

in which can you even time the device to go off to spread chemical gasses. >> reporter: what is this device called. >> it means the invention. >> reporter: how did al qaeda plan to use these? >> to attack small and closed places, cinemas, night clubs and entertainment venues. however, in some cases they wanted to attack even transportation systems, especially the underground transportation system. >> reporter: it wasn't lost on dean that he had helped terrorists perfect a weapons of mass destruction. and what did you feel being in afghanistan partaking of the development, the experimentation with this new kind of weapon? >> reporter: uncomfortable but at the same time, you have to be there, you have to witness it, you have to see it, otherwise how can you report on it? that's the conundrum of spying. you have to witness horrible things in order to prevent them.

>> reporter: but before any poison gas device would be deployed, al qaeda planned to use other unconventional weapons for the largest terror attack ever on american soil. coming up, aimen dean is asked to relay a message to his jihadi brothers in the u.k. >> before the end of august they must come with their families to afghanistan because something big is going to happen. anyone can get you ready, holiday inn express gets you the readiest. because ready gives a pep talk. showtime! but the readiest gives a pep rally. i cleared my inbox! holiday inn express, be the readiest. holiday inn express, the smoother the skin,

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>> reporter: august 6, 2001. president bush receives his daily intelligence briefing. it includes this memberio tigo "bin laden intending to strike in the u.s. al qaeda was preparing to attack american interests somewhere in the world. british spy ammaimen dean said of the warnings came from him. in june he had been summoned at the terrorist group headquarters in afghanistan.

>> he asked me if i'm going back to london. i said yes. he said i need to you tell four individuals going to t individuals in the u.k. they need to sort out their affairs before the end of august and bring their families. because something big is going to happen. >> reporter: they also had specific instructions for dean. >> stay in the u.s. >> reporter: he was telegraphing something big is going to happen and we expect the united states to retaliate. indeed. >> reporter: did you ask him what was going to happen? >> i wouldn't even dare. it was plastered all over the walls in al qaeda's compound, "you only need to know what you need to know." >> reporter: days later, he arrived back in london and immediately briefed his

handlers. >> they were more or less shocked to hear it. they asked me to go over details, hours and hours describing every single second of that encounter. so they were guessing at the time that it will be an attack similar to the nairobi and tanzania in 1998 or again the "u.s.s. cole" in 2000. no one even guessed it's going to be on the magnitude of 9/11. >> there was a certain amount of chatter that something big might go down but the details of the plot were kept really quite secret. >> reporter: on september 11th, aimen dean was walking down a busy street in central london when he wait a minute upon a crowd. >> basically i saw lots of people congregating around a shop window, which was at the time one of the shops that sells big tvs and i looked at it and i saw one the towers of the world trade center on fire. and the first thing that came to my mind was this is al qaeda, no

question about it. >> reporter: what did you think? >> that the world is going to change. it will never be the same again. >> reporter: dean would remain undercover and be deployed by the british to bahrain in late 2002. there an al qaeda operative approached him hoping to make use of his unique skills, the expertise he'd acquired at a chemical weapons lab in afghanistan. this time the weapon was going to be poison gas and the target was to be new york's subway system. >> i was actually involved in that plot because i was actually invited to take part in that plot because i was one of the only surviving people who witnessed the development of that device. so i was asked to comment on the accuracy of the diagrams and the accuracy of the ingredients and the accuracy of the measurements. >> reporter: he needed to alert

his british handlers and fast. >> we met in dubai early in 2003 to discuss the ramifications and debrief them completely about what i've learned so far. and of course they have alerted their american counterparts. >> reporter: phil mudd was among those eat the cia informed of the plot and the weapon. >> think new york city subway. you're talking about a simple device that almost looks like it could be contained in paint cans, easily constructed by maybe someone with a high school education that could have killed dozens or hundreds of people in a major transport hub like a subway, and report on that coming from a credible source. my world back in '03, this is big news. >> reporter: the attack was never launched because, according to dean, the number two man in al qaeda, eamon al

z zirry judged the timing was not right. was it viable? the cia decided to find out. >> the assessment we had was that it could work. we built a device we brought back into the cia and a lot of people, including people at the white house, wanted to see it. >> reporter: president bush reportedly picked it up and said "thing's a nightmare." had it gone off in the new york subway system, it would have been terrifying. >> i think the panic that would have resulted from this would have been hugely significant. >> well, of course there were more plots. the hid of the al qaeda division, he send the instructions to another sell in bahrain to carry out an attack against the u.s. fifth fleet, especially their personnel. >> reporter: the ring leader reached out to him. >> he asked for my help to build the chemical weapons for use in in close spaces.

we're talking here about night clubs and bars to be deployed against american personnel who are celebrating new year's eve. >> reporter: wow. what did you say? >> i said yes, of course i'm going to participate. i even said let's start preparing for it and i give him a list of ingredients that need to be secured. of course i fed that intelligence to my handlers in the u.k. >> reporter: having an agent at the heart of the plot gave british intelligence a unique opportunity to identify terrorists and dismantle their network in the persian gulf. by the time that happened, bahrainian authorities arrested some of the plotters, including dean. among those that stayed out of reach was the head of al qaeda's global operations. there would be no trial for dean because he was whisked away to london with his secret identity somehow still in tact.

next, poisoned luxury cars. >> reporter: the nicotine basically in a poison caused the person either to die or have serious damage. >> reporter: and dean's cover is finally blown. >> i was shocked and dismayed and angry and afraid for my safety of course. ♪ ♪

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amond dean was back in london sikts years when yet another terrorist with another scheme asked for his help. >> i was contacted by one of the individuals heading the jihadist cells, and at the time he want today carry out a poison attack, one of the poisons i had developed. >> a nicotine poison. who knew. >> well you can extract it from cigarettes. >> the plan was to poison some of london's most affluent

residents. >> this individual wanted to use that poison in order to poison the car handles of luxury cars in london. >> so how would that work? someone would put their hand on the handle of the car. >> of course. innicotine would seep into the blood vessels and cause the person either to die or have serious damage. >> before they could poison anyone the plotters were arrested. just weeks later. >> this is the worst tearest attack in luondon. >> a different terrorist cell succeeded. there were three suicide bombings on three different london subway trains. >> a fourth suicide bomber blew himself up on a double-decker bus. in all 52 people were killed and 700 more injured. it was britain's 9/11.

>> at exactly 12:00 noon the city comes to a standstill. >> as the city mourned and the victims were laid to rest a. mond dean was determined to continue on as a spy, hoping to thwart future al-qaeda attacks. but a year later his spy days would come to a sudden and unexpected end. >> it was the first real holiday for me in 11 years when i would see the text message and a contact of mine and he was telling me what the hell is this, go and see "the times." >> dean immediately went into an internet cafe and looked up the time magazine website. what he found was an article previewing a soon to be published book. the article provided information

on the new york subway plot that dean had infiltrated. it revealed that western spy agencies has been receiving accurate tips from an intelligence asset inside al-qaeda. and it disclosed one more detail that stunned dean. >> stupidly they were the author was talking about an intelligence asset and he used my name, my real name and calling me by my real name. >> why? >> i don't know why. but nonetheless i was shocked and dismayed and angry and afraid for my safety, of course. >> dean's cover was blown. he immediately contacted his handlers at the british intelligence agency mi6. >> and they told me come on the first train back to london.

so i came back, and of course it was a crisis. and it was dealt at the highest level of mi6 at the time, but nonetheless the damage was done. >> which meant? >> which meant i was basically no longer able to continue working for the u.k. intelligence service after eight years of diligent work. >> someone had leaked details about him to the book's author and now western intelligence agencies would lose one of their most valuable spies. >> in this case the leak is devastating. you can't run a human informant and it's tough to get human informants inside al-qaeda or isis because someone decided they wanted to talk to the press more. >> in the united states it's a particular problem because thousands of people have top clearance. the leaking and so on. >> al-qaeda was now aware it had a spy inside its ranks but two

years would pass before it finally identified amond dean as the traitor. in 2008 a religious decree was issued that called for dean to be killed. >> so i was going to be living under a death sentence. >> had there been any attempts on your life? >> in september 2016 i was supposed to go to a family wedding, and i was warned there were two individuals who themselves were al-qaeda members and they would actually attempt to do me harm. and so as a result i aborted my trip to that wedding. >> dean would live the rest of his life looking over his shoulder and also worrying about what is now on the internet. blueprints for the deadly poison gas device that he helped al-qaeda create. >> you look at the accessibility to devices like this for anybody

who wants to build them on the internet, i think if you're in the u.s. you've got to be concerned about that. >> and do you think those kind of plots are still on their agenda? >> it is on their agenda and it has actually filtered into isis. >> the threat remains. dean now consults on security and counter terrorism for governments and corporations. he is determined to continue speaking out despite the risks. >> if we don't take risks while they take risks with their own lives for the sake of their cause, then they will win in the end. squeeze the toothpaste from the bottom and floss to set a good example. you fine tune the proposal, change the water jug so no one else has to, get home for dinner and feed the cat.

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in an average man's life there are two or three emotional experiences burned into his heart and his brain. and no matter what happens to me i'll remember november 22nd as long as i live. >> there has been an attempt on the life of president kennedy. >> they are combing the floors of the texas book depository building to find the assassin. >> did you shoot the president? >> i'm just a patsy.