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Threat from north korea. fepg shot down a mock intercontinental ballistic missile. the test using an upgraded ground-based interceptor system. conducted over the pacific owing. now defense officials expressing confidence the u.s. now has a capable credible deterrent against a very real threat. lets get more from paula hancock. she joins us live from seoul. some observers say its not 100%. some of these tests before have failed. good morning. >> reporter: thats right. the last two have been succe...

This as high-speed effort to hit one bullet with another bullet, specifying just how difficult it is to take out even a mock up icbm in mid-flight. they say it was a success. we heard from the pentagon and also the missile defense agency saying its not just because of north korea that they are making sure this intercept missile is successful but the fact is north korea is pretty much the only sovereign state around the world at this point thats threatening the united states. we heard at the begi...