US officials say they take the threat seriously
Communications intercepts in recent days indicated that Pyongyang could be planning to launch a mobile ballistic missile in the coming days or weeks, the official first told CNN. It's unknown whether it would be a test or a strike.
The news emerged as South Korean Defense Minister Kim Kwan-jin told a parliamentary committee in Seoul that the North has moved a medium-range missile to its east coast for an imminent test firing or military drill.
The missile doesn't appear to be aimed at the U.S. mainland, Kim said, according to the semi-official South Korean news agency Yonhap.