Is North Korea planning a long-range rocket launch?

CNN: It's a site so secretive that an underground railroad line delivers parts into a movable building, hiding activity from view.

North Korea describes it as a place where the country launches satellites into space.

But U.S. spy satellites are keeping a sharp eye on North Korea's Sohae Satellite Launching Station at Tongchang-ri. And increased movement of equipment and personnel into the facility is raising renewed concerns in the U.S. military and intelligence community that something more sinister could be in the offing there.

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