A visitor looks at a display illustrating the damage a 1MT class nuclear weapon would cause if detonated in Seoul, at the Korea War Memorial Museum in Seoul, South Korea, Thursday, Jan. 7, 2016. The United States, South Korea and Japan agreed to launch a "united and strong" international response to North Korea's apparent fourth nuclear test, as experts scrambled Thursday to find more details about the detonation that drew worldwide skepticism and condemnation. (AP Photo/Ahn Young-joon)
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