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11:00 p.m. eastern right here on cnn. coming up, u.s. officials put together what they say is a likely scenario for the downing of that metrojet airliner over sinai, suggesting an airport insider helped plant military explosives with a timing device. and a major security scare at a busy u.s. airport. why armed officers boarded a flight in miami and ordered passengers to put their hands up. how much protein does your dog food have? 18%? 20? nutrient-dense purina one true instinct with real salmon and tuna has 30% protein. support your active dog's whole body health with purina one.

>> and it had a timing device on it, eric. it could have been used, connected to some c 4 it could have been used as one and we won't be talking about it. if there were a bunch of kids killed in that school. let's stop with the political correctness. let's put this together. >> thank you both. when we come back, our question of the day, straight ahead. bring us your aching and sleep deprived. bring us those who want to feel well rested. aleve pm.

Something that could be as small explosive device as something like a hand grenade with some sort of timing device. well, you have to look in desks, you have to look in heat ducts. there are a lot of places. that's why you need the bomb dogs. but again, you know, bomb dogs aren't perfect. they could miss something. explosive devices could be, in the worst case scenario, a booby trap attached to them. so this is a tremendous undertaking that they have to do. they have to bring in all of these outside resources to assist in this type of search. and, chris, if we go back to the threat itself, i'v...

Official in japan are investigating two small explosions last night outside an american air base in tokyo. authorities believe they were caused by an improvised device. they found a timing mechanism at the scene and two tubes. carl penhall is live with the latest. i'm sure the bomb squad is out there and investigators are trying to find out any evidence at all to figure out what happened here? >> reporter: jason a rosa, absolutely. the japanese police are taking this very seriously. we saw bomb squads 40 or 50 members, in fact, the bomb squad combing that area a few hundred yards from the peri...

Phone could be used to detonate this. a phone could be used as a timing device. and that small piece of circuit board could also be part of an electronic timer. so there are several different directions it could go. >> fran townsend, in terms of the international element to this, if it is a foreign group related to al qaeda or whatever, and they have either absconded or tried to abscond the country, what are the wheels that go into motion there as far as national security? >> sure. piers, i think we don't have any indication yet that this is either foreign related or even inspired but regardle...