Researchers have found an undisclosed ballistic missile base in North Korea, and say there could be as many as 20 secret bases across the country. Beyond Parallel, a project sponsored by the defense think tank Center for Strategic and International Studies, released a report on Monday that revealed the existence of the Sino-ri Missile Operating Base, 130 miles north of the DMZ. Satellite photos of the base taken in late December show an entrance to an underground bunker, hardened shelters, and the headquarters of the Korean People's Army Strategic Rocket Forces missile brigade, NBC News reports. Beyond Parallel says the base has been crucial in the development of ballistic missiles able to reach Japan, South Korea, and Guam. In February, the U.S. and North Korea will meet for a second nuclear summit.

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