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An explosive statement overnight from north korea. it said it destroyed parts of its nuclear test sites just weeks before this planned summit. only a handful of journalists were allowed inside of north korea to witness this and our will ripley is one of them. watch. >> reporter: right now were on a train making the 12 hour journey from the nuclear test site back to the coastal city of won san. we spent about ten hours on the ground at the nuclear test site. a lot more time than we were expecting...