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Security measures. the state tested its warning sirens last year for the first time since the cold war. kelly: and we are joined now on the phone by foreign affairs journalist gordon chang, author of the book nuclear showdown u north korea takes over the world. gordon, good of you to join us today but a very bad and time for people that received warning on cell phones to take shelter, what do you make of this. >> this is a real concern. the reason is first of all the warning system obviously fai...