North Korea said Jan. 6, 2016, it had conducted a hydrogen bomb test. If confirmed, the move would put Pyongyang a big step closer toward improving its still-limited nuclear arsenal.
In this Jan. 6, 2016, United Nations handout photo, UN Secretary-General Ban Ki-moon, left, holds a emergency meeting with senior advisors to discuss the latest developments in North Korea.
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People watch a news report on North Korea’s first hydrogen bomb test at a railroad station in Seoul on Jan. 6, 2016.
(Jung Yeon-Je / AFP/Getty Images)
A man watches a news report at a railroad station in Seoul, South Korea, on Jan. 6, 2016, after seismologists detected a 5.1-magnitude tremor next to North Korea’s main atomic test site in the northeast of the country. North Korea said it had successfully carried out its first hydrogen bomb test.
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South Korean army soldiers patrol the barbed-wire fence in Paju, near the border with North Korea, South Korea, Wednesday, Jan. 6, 2016. North Korea said it conducted a powerful hydrogen bomb test Wednesday, a defiant and surprising move that, if confirmed, would be a huge jump in Pyongyang’s quest to improve its still-limited nuclear arsenal.(AP Photo/Ahn Young-joon) (Ahn Young-joon / AP)
In this photograph released by North Korea’s official Korean Central News Agency on Jan. 6, 2016, North Korean people celebrate the success of the first hydrogen bomb test in Pyongyang.
(KNS, AFP/Getty Images)
In this photograph released by North Korea’s official Korean Central News Agency on Jan. 6, 2016, North Korean people celebrate the success of the first hydrogen bomb test in Pyongyang.
(KNS, AFP/Getty Images)