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For the ingredients that he was purchasing, but he was identified because of good intelligence monitoring e-mail accounts where he came up. >> reporter: jason carroll, cnn, new york. >> i want to bring in former fbi counter terrorism expert tim clemente and also our expert retired general mark hertling. i want to ask you how detectable this is at an airport or by bomb sniffing dogs? >> well, it is very difficult to detect. the arroma is not easily detectd by electronics or dogs, and something they try to do is to make it more stable, and the bombers will put it in a liquid to stabilize it, and...

Last year, a man dug a tunnel under a fence at orlando international and climbed into the wheel well of a jetblue plane. in 2006, a phoenix pilot told air traffic controllers he almost struck a man while he was taking off. the man was on the runway. the man said he was trying to take a short tutt. and a mentally unstable man jumped the fence at lax eight times in one year. >> who patrols the outside of airports trace? >> well the individual airports are actually responsible for securing securing the perimeters. since 9/11 u.s. airports have spent more than $650 million on perimeter fences. cam...

Moving at 20 to 30 centimeters per second it could still have traveled 200 to 300 kilometers during the past two weeks. but at this point we do believe it is still in this vicinity. if it were to get caught up in the stronger current, of course, it would pick up its pace. so this is about 2,500 kilometers from the perth coastline here and as we take you down, you can just see how incredibly deep the indian ocean basin is and those water temperatures, by the way, in case you were wondering running 12 to 15 degrees celsius. but the basin itself incredibly deep, some two to three kilometers deep,...

U.s. officials say the terror threat in sochi is the highest of any olympics ever and this morning several new developments on that front. olympic delegations from germany, italy, and hungary say thai gotten threatening letters and e-mails warning about terror atax against their athletes. the international olympic committee sent out a statement saying the threats are not credible. president obama called russian president vladimir putin to talk security and nbc news learned u.s. military officials are considering sharing sophisticated detection devices to find roadside bombs. i'm joined by mich...

To investigate even after intelligence folks came forward with information about the tsarnaevs. when you say boston we hear in cambridge think to a degree. and it is at front of mind. bill: there is no connection right now to the tsarnaev brothers or boston marathon bombing or anything on campus of harvard university. how familiar with are you with the cambridge police department, campus police, state police who were told, are responding now with k-9 units and perhaps some sort of detection devices to figure out whether or not this is the real deal or whether or not it is a prank? >> we saw ho...