elaine quijano, thank you very much. well, president obama has been looking for a few good ideas to prevent nuclear terrorism. today, at a summit meeting of more than 50 nations, mr. obama said the international community holds 2,000 tons of nuclear material, and if an the amount of size of an apple fell into the wrong hands tit would change the world. house. >> as the danger of a terrorist group obtaining and using a nuclear weapon is one of the greatest threats to global security. >> reporter: president obama warned world leaders that groups like isis, which has already used chemical weapons, could have larger ambitions. >> there's no doubt that if these madmen ever got their hands on a nuclear bomb or nuclear material, they most certainly will use it to kill as many innocent people as possible. >> reporter: u.s. intelligence does not believe isis has the capability to build a nuclear warhead, but it could steal one, hijack a nuclear facility, or craft a so-called dirty bomb with materials small enough to fit in a coke