Satellite imagery of new construction work at an underground facility in North Korea has renewed questions over a rumored nuclear site, though analysts caution against jumping to conclusions.

Newsweek has contacted the Pentagon and North Korean Embassy in China for comment via email.

Why It Matters

The reports come as North Korean leader Kim Jong Un presses ahead with a sweeping nuclear buildup. Analysts estimate that North Korea—officially the Democratic People's Republic of Korea (DPRK)—may have produced about 50 nuclear warheads and likely has enough fissile material for 90 more, according to estimates by the Federation of American Scientists. The country also continues to expand its missile arsenal, including intercontinental ballistic missiles believed capable of carrying nuc

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