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A South Korean man watches TV news showing file footage of the demolition of the cooling tower of the Yongbyon nuclear complex, following a report of a possible nuclear test conducted by North Korea, at the Seoul train station in Seoul, South Korea, Tuesday, Feb. 12, 2013. South Korea said it suspects a nuclear test caused an earthquake Tuesday in North Korea just north of a site where the country conducted two previous atomic tests. North Korea has yet to confirm whether the tremor resulted from a widely anticipated third nuclear test, though an analyst in Seoul said a nuclear detonation was a "high possibility." The Korean letters on TV read: "Government official says possibility of a nuclear test is high." (AP Photo/Lee Jin-man)