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Has already developed. while international monitors worked to determine the exact power of the blast. >> signals were detected on seismic stations and they were immediately made available to all of our member states. >> but by this afternoon, the white house was already undermining north korea's claim. >> the initial analysis that's been conducted of the events that were reported overnight is not consistent with north korean's claim of a successful hydrogen bomb test. >> reporter: still, the debt nation at an underground facility is the fourth by north korea since 2006, all in gross violation ...

This shows a higher level of technical expertise. and the atom bomb, oddly enough, even though it's physically a big device normally, it presents a smaller blast in nuclear terms than the hydrogen bomb which can be made smaller and produce a bigger blast. so kate, this is the kind of thing that would be easier fitted onto a rocket that north korea has right now and launched at somebody else. >> hence why it is so dangerous and such a concern in the united states and beyond. so how big would the blast -- you say it's bigger. how big would the blast be from a hydrogen bomb? >> if we went back to...