were there any warning signs? whitney houston's final hours. nuclear standoff. it happened in japan. could it happen here? >> i thought it was fatally floud. unfortunately fukushima proved me rate. >> concerns over a nuclear facility. deadly cargo, would you believe this laser printer is a weapon of terror? we'll show you how al qaeda got these printer bombs through security and onto planes. revealing investigations, fascinating characters, stories with impact. this is cnn presents with your host tonight randy kay and dr. sanjay gupta. >> good evening. whitney houston will be remembered as one of the greatest voices of her generation and many of her closest friends say the troubled star was poised to make a comeback. that was tragically cut short with her untimely death. >> whitney houston's soaring talent was shadowed we her troubles with addiction and her marriage and don lemon looks at her rise to tame fame, had her fall from superstar dom and the final hours in her troubled life. ♪ but above all this i wish you love ♪ >> that legendary ballod, that blinding beauty, that breathtaking voice. ♪ i will always love you >> whitney houston, the shy jersey girl who belted her way to superstar dom, six grammys, and a record seven consecutive number one singles. for a time she was pop's greatest love of all. ♪ greatest love of all >> to hear her voice was a miracle because for anybody to be able to do with a voice what she did with her's speaks to a divine order. >> whitney houston, the icon, unimaginably talented, but also fatally flawed. >> there were many different sides to whitney. there was the performer, the professional, the addict, and you never knew which whitney you were going to get. >> if houston was blessed by the heavens, she was most certainly cursed with her own demons. a contradiction right up to her final days. >> this was not a woman who was depressed, upset, high, drunk. >> it was immediate. you could smell the stench of cigarettes and liquor, and i am like, oh, my god, she is a mess right now. >> whitney houston died here at the beverly hilton on february 11th, the voice of a generation silenced forever. a tragic ending to a life filled with promise that was almost preordained. with a gospel legend for a mother, and a cousin named dionne warwick, houston was born to sing. >> when we first saw whitney, when you first heard whitney, you knew there was something special happening here. >> legendary music producer clyde davis certainly knew. he discovered houston and changed her life forever. he packaged and polished the 1-year-old sen -- 19-year-old sensation into a pure pop princess, at least on the surface. >> one source who worked with whitney told us she dwebl was not a goody two-shoes in any sense of the word. >> houston's bad girl side may have ultimately drawn her to r & b bad boy bobby brown. >> she was a girl from the streets of newark and fell in love with a bad boy with a good voice, so, you know, her fans, shocked. those who knew her best really weren't surprised. >> houston and brown traded rings in 1992, a personal high matched only by a professional one that very same year. the "body guard" launched top selling sound track of all time. even as the crossover superstar commanded millions for movies like "approacher's wife" she increasingly struggled with her fame. >> did she ever talk to you about the stress of fame? >> she said to me, you don't know what it is like being me. >> i am stressed out all the time. >> that stress was only compounded by houston's often rocky marriage. >> they were really happy at first but pretty soon the relationship turned pretty volatile, and when she was under pressure, she tended to turn to drugs and alcohol. >> when houston began a string of missed appearances and cancelations, many pointed their finger at bobby brown for his wife's mounting troubles with drugs. >> i hate to say that she had started before. she had met bobby brown. >> houston's increasingly erratic behavior even played out before the cameras in the short-lived reality show "being bobby brown," but when brown spoke to cnn in 2005, he insisted he and his famous wife were finally sober. >> i am working on a year-and-a-half much sobriety, and my wife, she is working on her year, so we're really doing good, and i am proud of her. >> yet her attempts at recovery only ended in relapse for houston and the years of drug abuse had taken their toll. >> i was shocked at her condition. >> what happened to whitney houston's voice? >> i think that the psychological impact of being who she was drove her into lifestyle habits that ultimately were destructive. >> by may 2011 whitney houston was divorced. her attempt at a comeback a year earlier was in shambles. with all of these crushing personal setbacks, she entered into a voluntary outpatient program for drug and alcohol treatment. friends say she just needed a break. >> i know that she was pacing herself because she was preparing for the movie. i don't know exactly what she went through to do that. >> that movie was sparkle, and by the time whitney houston began doing press for the film, she did seem like a different woman. that says sean robinson did the last one-on-one interview with her. >> when i look whitney houston in her eyes, i thought that this woman is coming back. >> looks can be deceiving, especially when you are talking about whitney houston. her final days when we return. ♪ [ woman ] when i grow up, i want to take him on his first flight. i want to run a marathon. i'm going to own my own restaurant. when i grow up, i'm going to start a band. 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[ding] [fans whirring] announcer: chill raw and prepared foods promptly. one in 6 americans will get sick from food poisoning this year. check your steps at foodsafety.gov. will be giving away passafree copies of the alcoholism & addiction cure. to get yours, go to ssagesmalibubook.com. 1. ♪ >> with a new movie and a new sparkle of her own, a seemingly healthy whitney houston started the new year poised to perhaps make that long awaited comeback. behind the scenes some now all too familiar and alarming behavior. >> her friends told us that even though she had successfully gone to rehab last year and had this great experience filming "sparkle," there are always temptations and unfortunately she started partying again and spending time with perhaps the wrong people and just fell right back into that sad spiral. >> three days before the annual grammy awards show whitney houston was staying here at the beverly hilton. it is here where over several days sources say the pop superstar was seen consuming considerable amounts of alcohol and acting erratically. >> they were covering a press event when the singer raised eyebrows at the hotel pool. >> one of the conversations i had with a grammy staffer was that security was getting calls from guests that she was doing handstands by the pool. oh, that's bizarre. >> and then there was this. >> kennedy says houston smelled of cigarettes and alcohol when she burst in on her mentor clyde davis. >> come say hi to your godfather. come say hi to your god dad. >> i am like, oh, my god, you are a mess right now and you are embarrassing yourself. i am embarrassed for you. >> the pop star appeared anything but disshefled or disoriented later that night. >> whitney houston attended a pregrammy party at this hollywood night club. as she walked the red carpet witnesses say she had it together and was on her best behavior. >> adam ambrose is a publicist for "true hollywood". >> she walked here holding hands with bobbi kristina and they both looked radiant and looking fantastic. >> she was even up for impromptu intertakening and surprised everyone when she joined her friend kelly price on stage. ♪ >> the place erupted. it was very sweet. it was really touching. ♪ >> fun times, but too much of a good time? not so says kelly price. while she says that houston had champagne at the party, she denies reports that things got out of hand with her friend. >> this was not a woman who was depressed, upset, high, drunk. she was clearly in her right mind. she was not acting erratic. >> access hollywood's shawn robinson says the pictures sane that thursday night tell a whole different story. >> i said who is that? what the hell happened? what happened in three months that took her from this person who seemed to really have it altogether to this person who looked very disshefled and just kind of not there? ♪ >> in a sad reality, houston hadn't been herself in years, at least not the one fans had come to love at the height of her super-stardom. her struggles with addiction, the loss of her once incomparable voice, the pressures of fame had all but destroyed houston's once magnificent facade, and by saturday, february 11th, any hope of a comeback would be over. hours away from attending clyde davis' annual pregrammy celebration whitney houston was in other fourth floor suite here at the beverly hilton when a music executive staying on the floor above hers was jolted awake by a loud thud. >> a number of the entourage went in and discovered her unconscious in the bath tub partially submerged. the member of the entore raj called 911 immediately. >> within minutes paramedics arrived making desperate attempts to revive her. >> her brother gary was in the room and his wife pat, obviously praying for a miracle. >> houston's close friend kim ber received a troubled call and raised over to the hotel. >> you could feel that something was terribly wrong, and by then i saw the yellow police tape down the hall. i rushed to the room and i said what's going on here? pat told me she is gone. >> whitney houston was dead on the eve of music's biggest night, one of its biggest icons was gone. she was only 48. >> bobbi kristina broke down in the hotel lobby and was screaming over and over again what's wrong with her? what's wrong with her? so we can only imagine what was going through this girl's mind, but her mother was her world. >> i wanted everything to just stop. wait a minute. what i felt was happening i didn't want to be happening. >> a so far as close to the death investigation tells me prescription drugs including zan axe were found in whitney houston's hotel room at the beverly hilton. the coroner's office hopes subpoenas of the medical records will help them learn more. they're waiting for toxicology reports to determine exactly how the singer died. what actually happened to whitney houston is still a mystery and still under investigation. whatever caused her death, the fact remains that a life built on triumph ended in tragedy. for those who knew her, the mega star known as the voice will always sing on. >> when someone like that dies, the music takes on a new meaning. the music takes on a meaning now that whitney is not here, and the song that makes me very emotional was that song "all at once," and the lyrics are so strong. ♪ all at once >> and it hit me you're not coming back "all at once". ♪ i am realizing you're not coming back ♪ ♪ and it finally hit me all at once ♪ >> coming up a troubled nuclear facility at the center of a debate that could determine the future of nuclear energy in the united states. managing expenses seems to... get in the way. not anymore. ink, the small business card from chase introduces jot an on-the-go expense app made exclusively for ink customers. custom categorize your expenses anywhere. save time and get back to what you love. the latest innovation. only for ink customers. learn more at chase.com/ink ♪[music plays] ♪[music plays] purina one beyond. food for your cat or dog. we want to protect the house. right. but... home security systems can be really expensive. to save money, we actually just adopted a rescue panther. i think i'm goin-... shhh! we find that we don't need to sleep that much. there's an easier way to save. geico. fifteen minutes could save you fifteen percent or more. the world needs more energy. where's it going to come from? ♪ that's why right here, in australia, chevron is building one of the biggest natural gas projects in the world. enough power for a city the size of singapore for 50 years. what's it going to do to the planet? natural gas is the cleanest conventional fuel there is. we've got to be smart about this. it's a smart way to go. ♪ since an earthquake and a tsunami tu fukushima power plant brought nuclear disaster to japan. according to some experts a similar tragedy could happen here in the united states. the 40-year-old vermont nuclear plant has the exact design and it is at the center of a battle that could shape the future of nuclear power in the united states. amber lyon exposes the troubled history of the yankee nuclear plant and why some people in vermont want to shut it down. >> march 11, 2011, an earthquake, then a tsunami devastate the east coast of japan. >> there may be a few inside there. >> over the next several days and weeks the damaged puck -- begins to worry the world and fire breaks out and radiation intoes into the area. it is the worst nuclear accident since cher noybl leaving many wondering could this happen here? >> we're here in vermont where there is a battle brewing that could determine the future of nuclear power for the u.s. at the center of this battle this nuclear plant, this same design is fukushima. the vermont yankee nuclear power station is 40 years old. it is operating license issued by the u.s. nuclear regulatory commission is set to expire next month. it is one of the 23 mark-1 design nuclear reactors in the u.s. the problems with this design are well known to industry insiders including the nrc. according to government documents dating back to 1972. >> 1972 the nrc said we never should have license this had design period, but they also said we have so many of them licensed already, that if we were to change our minds, that would ruin nuclear power forever. >> arnie gunder son is a former nuclear industry executive turned whistle blower with decades of experience in the industry. he is appointed the chair of the state panel overseeing the vermont yankee reactor. he says because of design flaws, vermont yankee and other plants like it across the u.s. are one major earthquake, tornado, or flood away from disaster. that is a fear bordering on reality after massive floods and tornados hit vermont last year. if something were to go wrong at vermont yankee, this would be the damage area, and given its recent history under the ownership of a company called entergy, there is reason to be concerned. >> let's go over this list one by one of all these mechanical errors. >> we had six piping leaks in the plant, three piping leaks in the ground, then we had the fire and the cooling tower collapse. that's just in the lasts five years. >> is this normal? >> it is not normal when cooling towers collapse. it is the only time in the history of nuclear power that a cooling tower as collapsed. the key is why the fire? why the tower collapse? in every case we have been able to trace it back to inadequate maintenance. every one of the major failures could have been preventible. >> none of these problems would lead to a meltdown but show a pattern of sloppy maintenance. vermont yankee sits on the connecticut river across from this elementary school. nrc reports show the plant has been leaking radioactive materials into the environment for years although it levels the agency says are safe for the public. >> they found six or seven different isotopes, most of which last a long time. >> in 2010 a fish caught in the connecticut river tested positive for stram 90 in its flesh. that seeks out bone causing leukemia and it doesn't leave the environment for 30 years. for gunderson, the logical source was vermont yankee. >> i think if you find a fish with radioactive stram next to a plant leaking radioactive stranch ium, a high correlation it came from the plant. >> so far testing has suggested otherwise. >> this is dr. bill irwin, and he is with the vermont department of health. this is where you keep the fish you caught in the connecticut river? >> yes, this is correct. >> a recent study released by dr. irwin showed that fish almost 150 miles away in a lake had straun tium in them. he believes caused by fallout from nuclear testing. >> the other place we found it is in the natural environment every where in not only that area of vermont but all areas of vermont and throughout the world, and again it come from fallout from nuclear weapons testing. >> more tests need to be conducted to be certain. despite its age and recent problems, last year the nrc granted vermont yankee a 20-year extension, so instead of closing in march 2012, it could now be open until march 2032. >> where i have had problems is that the nrc has in some cases become a cheerleader for the nuclear industry. >> clearly the nrc has to be vigilant. >> bernie sanders sits on the senate committee that oversees the nrc. he is worried as an older generation of america's reactors comes up for renewal. >> they have always extended when companies have come in and said we would like an extension. i believe over 60, in over 60 instances they granted every one, and that's a problem. that's a problem. >> we wanted to talk to the nrc. over a sikts-week period -- six week period we repeatedly requested an interview at any time or day of their choice but we were told they were over booked. we decided to show up anyway and see if we could get answers. a spokesman came outside soon after we arrived. >> you received the agency's response via our director of public affairs. >> yes. >> the answer of the agency. >> no one is going to talk to us? >> no. >> i actually have the exact quote here on your site. it says that the nrc is devoted to open government, open accountable, accessible. >> yes, all of our information is available on our website. >> but you guys are accessible to the public, how come you can't sit down for a five minute interview to explain your side of the story? >> because the subject that you want to discuss is something that is currently a matter of litigation that the agency cannot discuss. >> we don't want to just discuss the entergy plant, sir. we want to discuss overall how the nrc is regulating nuclear power in the united states. >> one reason the nrc wouldn't talk to us is that the vermont yankee plant is at the center of a pitched legal battle over who decides the raengtor's -- reactor's fate, and the stakes are enormous. >> this case out of the state of vermont has potentially very real national consequences. >> coming up, will the people of vermont have a say in their own nuclear future? tdd# 1-800-345-2550 account service fees. tdd# 1-800-345-2550 and the most dreaded fees of all, hidden fees. tdd# 1-800-345-2550 at charles schwab, you won't pay fees on top of fees. tdd# 1-800-345-2550 no monthly account service fees. tdd# 1-800-345-2550 no hidden fees. tdd# 1-800-345-2550 and we rebate every atm fee. tdd# 1-800-345-2550 so talk to chuck tdd# 1-800-345-2550 because when it comes to talking, there is no fee. you'd do that for me? 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[ male announcer ] another reason more people stay with state farm. get to a better state. ♪ [ male announcer ] aggressive new styling. a more fuel-efficient turbocharged engine. and a completely redesigned interior. ♪ the new c-class with over 2,000 refinements. it's amazing...inside and out. see your authorized mercedes-benz dealer for exceptional offers through mercedes-benz financial services. presents with your host randy kay and dr. sanjay gupta. >> the state of vermont wants to close down the only nuclear power plant in the state when its original operating license expires on march 21st. the federal government says it can stay open an additional 20 years. >> amber lyon takes us inside this battle over a nuclear plant that could determine the future of ageing plants all over this country. >> the vermont yankee nuclear plant is a test case for the fate of aging reactors all over the country. in 2002 it was purchased from the state by a private new orleans-based company, entergy, when owns 11 plants across the country. as a condition of the sale entergy signed an agreement with the state saying they would not operate the plant past 2012 unless a state panel agreed. four years later vermont amended the agreement to give the legislature a say in whether the plant could stay open. overall, it has been a profitable deal for entergy. >> they bought it really cheap. they bought it for $170 million. a new plant costs $20 billion. they bought it for 100 times less than a new plant would cost. they can tell power at a rate that makes them on the order of half a million to a million dollars every day. >> under entergy's management the plant was plagued with problems. >> i had a lot of ex-employees contact me, and they're appalled at the way the plant is run. >> we wanted to speak with entergy's ceo, jay wayne leonard, but he declined our request. the company's credibility in vermont took a hit in january 2010 when radioactive water was discovered in monitoring wells. a leak coming from underground pipes beneath the plant. this after plant owners had testified under oath that such pipes didn't exist. entergy has since claimed to have fixed the problem. >> come on. you want the utmost of credibility and integrity on the part of the operators of nuclear power plants. >> vermont's attorney general, bill sorl was shocked to discover the pipes existed. >> they repeatedly denied they had that until they had a leak of tredium, a radioactive material, that was discovered in underground testing or monitoring wells and went, sorry, we made misleading statements to you. >> misleading? >> yeah. >> do you think they were misleading or were they lies? >> i don't know. they were not -- the statements they made were not true. >> shortly after the leak the vermont state senate voted overwhelmingly, we're talking 27-4 in a bipartisan vote to shut the plant down. entergy says that vote wasn't a part of the original agreement with the state, applied for, got a renewal of the license from the nrc, and then came back and sued vermont to keep vermont from ever shutting the plant down despite the fact the majority of residents want this plant out. >> entergy tried to have its cake and eat it too, if you will. they made promises to induce the state, state legislature, the public service board, to give them permission to operate, to store more spent fuels and then when the state exercised its authority under those agreements and under the law, and it didn't go entergy's way, then entergy backed out of the deals. >> in court papers entergy has said that vermont is trying to veto federal authority over nuclear power and therefore the state's actions are unconstitutional. opposition to the plant is not universal. in tiny vernon, vermont, where the plant is located, there are some who support the license extension. >> we're here in the center of vernon at the port side tavern which also happens to be the home of the tredium leak shot. so can i have you raise your hands if you support the court ruling that vermont yankee can stay open? >> it is a very safe place to work and be around. if vermont yankee shut down not only would we go out of business, it would have a major impact on the entire state of vermont. >> vermont yankee's original operating license is set to expire on march 21st, and the future of this plant is uncertain. most likely this case will go to the supreme court and what happens there could determine the future of ageing plants all across the country. >> amber lyon joins us now. i have to say that is a really troubling report. there is so many plants like this. where does that case stand now? >> as of now the state of vermont lost round one. a judge ruled the plant can stay open. whether vermont will appeal this is yet to be seen. the state is looking at creative ways they can tax entergy to keep the corporation from making a profit fa the plant which would then force it to shut down. >> we were saying people all over the world, this comes up and people want it open because it is their livelihood as well. it is back and forth. thank you so much. >> thank you. >> thanks, amber. coming up next, deadly cargo, the race to stop a potential airborne catastrophe. are you still sleeping? 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>> congressman ed markey has been sounding the alarm because air cargo often travels on passenger aircraft. >> 44% of all cargo on passenger planes in the united states comes in internationally. that cargo does not undergo the same level of scrutiny as the cargo on planes that fly domestically. >> al qaeda's best bomb maker targeted the weakness, a plot so sophisticated it would confuse authorities on three continents. >> we do know that the packages originated in yemen. >> from the terrorist group, al qaeda, and the arabian peninsula. >> the last two serious attempts to export to the united states both began here and both involved the same expert bomb maker, and both involved the same powerful and incredibly hard to detect explosive petn. >> he knows al qaeda's bombers well. >> we're talking about a new generation of very skillful builders. >> if we don't put in place comprehensive safe guards internationally, we should expect on a yearly basis they will try to find some way of using a passenger plane as a way to attack us. >> master bomb maker ib raama l.a. sira is imaginative and ruthless. in this al qaeda video the man in the red is his brother abdul l.a. h. they are saying their last goodbyes because he is departing on a suicide mission. inside his body is a bomb made by his brother. this is the aftermath of that mission, abdul l.a. h dead, his target a powerful saudi prince, muhammed ben naif with close ties to the white house injured. >> the jet with nearly 300 people on it and passengers told us they saw a flash, flames, and smoke. >> according to u.s. authorities, alisira is behind every recent plot to bow up air liners. he mast erd the underwear bomb when it was ignited aboard an airplane over detroit on christmas day 2009. in both attacks and the printer bombs, he chose the explosive petn. it has become his signature. >> it looks just like sugar, salt, it is easy to imagine how can can be stitched into clothing and hidden around the body and that's what makes petn such a challenge for airport security officials to detect. >> he managed to get the printers on two planes, bombs headed to the u.s. >> here we go. explosive expert sydney alford showed me the power of a tiny amount of petn. >> this really is a messy powder. >> then he agreed to replicate a power printer bombs revealing how they evaded detection time and time again. we left out critical steps. >> i show -- try to shake that out. i never tried this before. >> alford and his ink from the toner car tragedy. >> i will try to replace -- replace it with the white stuff and this is petn. >> because he knew the explosive would look like ink toner when x-rayed, making the bomb hard to detect. >> if that went off now, i would be instantly killed and bits of me will go around the room. >> alisiri leaves nothing to chance. no suicide bomber, but a sophisticated timer. >> they have timers in them. the cartridge is inserted and they click diagnostic. that is now a bomb. >> out in a field alford places the bomb on an aluminum sheet simulating the skin of an aircraft. >> 3-2-1. that is where the table was standing, and you can see the blast effect. if that had been part of an airplane's fuselage, then heaven help the airplane. it would have been a terminal event, i am afraid. >> next, with the bombs already on passenger jets, intelligence services scramble to interseptember them before they can explode. ♪[music plays] ♪[music plays] ♪[music plays] purina one beyond. food for your cat or dog. imagine if you could always see life [music] in the best light. every time of day. outdoors, or in. transitions® lenses automatically filter just the right amount of light. so you see everything the way it is meant to be seen. maybe even a little better. experience life well lit, ask for transitions adaptive lenses. 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[ kyle ] it's like we're connected. no we're not. yeah, we are. no...we're not. ♪ the allstate value plan. dollar for dollar, nobody protects you like allstate. in the wake of 9/11, congress mandated all cargo on passenger jets be screened but that's not always the case with air karg co and al qaeda knows air cargo is aviation's achilles heel, a weakness exploited. two deadly bombs nearly made it past screen neers u.s. air spares. nic robertson continues this investigation into this deadly threat of our airline safety. >> reporter: yemen, late october 2010, al qaeda mails two boxes. inside each a bomb hidden in a printer. one of those packages began their journey at this career service in the capital of yemen. counterintelligence officials believe the master bombmaker constructed the bombs, petn, before they began their journey to the united states. despite warnings putting u.s. and counterterrorism agencies on high alert, the bombs make it past screeners at the airport on to two passenger jets. this man was briefed by the head of saudi counterterrorism, the same saudi royal al qaeda had already tried to kill. he told him what happened next. a very lucky break. saudi intelligence gets a tip, an informant tells them about the plot. but it's too late to stop the bombs taking off on passenger jets. >> by that time the shipment has already left the country. >> all that the saudis know is that the bombs are headed to the u.s. then more luck. two packages were addressed to medieval crusade exan al qaeda blunder that leads the saudis to the tracking numbers for the bombs. saudi's prince calls the white house, which goes into crisis response mode. >> they never questioned the credibility of the information. >> reporter: british intelligence is say lettered, too, but authorities still can't locate the deadly cargo. >> so it was a very complicated to find out where the shipment is moving, where did is now. >> reporter: many hours and several flights later one package is located in dubai. the other at east midland's airport in britain. police arrive and search for the explosive. the police bomb squad finds the package, opens up the printer, but can't find the bomb, all the while the timer is counting down. >> i spoke on the phones a number of time to janet. >> i med with british home secretary who headed the response. >> in the erlt stages the amount of information is limited and the information has to come through, very often gradually. >> reporter: after scanners and dogs failed to find any explosives, police lift the security cordon around the airport, but the saudis assure the printer is a bomb. >> the task was to convince the other officer to look again and again. this was a major battle to convince him. >> reporter: tensions are rising. >> the saudis' intelligence officers were shouting and they were very nervous. so it was basically fighting against time. >> reporter: finally a breakthrough. investigators find the explosive inside the printer cartridges. >> it was clear that was sophisticated device. it was a device we hadn't seen in this sort of form previously. >> reporter: the british are about to find out they had been very lucky. forensic teams establish the explosive was found three and a half hours after the bomb was set to explode. it failed to go off because the bomb squad had unknowingly diffused it during their initial inspection by removing the printer cartridge, they'd broken the circuit to a hidden power supply and to a mobile phone timing device. >> if they hadn't inadvertently removed the explosives, that bomb could have gone off. >> the first thing i think about is the incredible bravery of our police officers. >> reporter: the bomb had been timed to detonate over the eastern united states. >> i want to briefly update the american people on a credible terrorist threat against our country. >> reporter: the bombs had flown through several airports in doha, dubai and colon without being detected. it was a very narrow escape. the u.s. and international partners have taken steps to bolster air cargo security but according to some are still falling short. >> the cargo on planes that flies in from overseas is broken into two category, high risk and low risk. well, the low risk cargo does not receive anywhere near the level of scrutiny as the high risk cargo. >> reporter: congressman ed markey authored a law that requires screening of all cargo on passenger jets. >> the administration is now saying that they are not going to meet the deadline for full implementation of screening of all cargo on international flights and now they've given an indefinite extension. >> reporter: as yemen's security policem plummets and al qaeda takes increasing control, the possibility of another petn bomb increases. the man who made the bombs is still on the loose here and western diplomats say he is always working on something new.

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