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FILE - In this Sept. 9, 2016 file photo, a South Korean marine watches a TV screen reporting about North Korea's possible nuclear test at the Seoul Railway Station in Seoul, South Korea. North Korea has conducted five nuclear tests, the first in 2006. All were conducted in the depths of Mount Mantap, a nondescript granite peak in the remote and heavily forested Hamgyong mountain range about 80 kilometers (50 miles) as the crow flies from Chongjin, the nearest big city. Since North Korea is the only country in the world that still conducts nuclear weapons tests, its Punggye-ri site on _ or mostly under _ Mount Mantap is also the world’s only active nuclear testing site. The letters on the screen read: "Explosion suspect." (Kim Ju-sung/Yonhap via AP, File)

FILE - In this Sept. 9, 2016 file photo, a South Korean marine watches a TV screen reporting about North Korea's possible nuclear test at the Seoul Railway Station in Seoul, South Korea. North Korea has conducted five nuclear tests, the first in 2006. All were conducted in the depths of Mount Mantap, a nondescript granite peak in the remote and heavily forested Hamgyong mountain range about 80 kilometers (50 miles) as the crow flies from Chongjin, the nearest big city. Since North Korea is the only country in the world that still conducts nuclear weapons tests, its Punggye-ri site on _ or mostly under _ Mount Mantap is also the world’s only active nuclear testing site. The letters on the screen read: "Explosion suspect." (Kim Ju-sung/Yonhap via AP, File)

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