N. Korea's digging of tunnels sparks speculations about nuke test

SEOUL, Feb. 20 (Yonhap) -- North Korea has been digging special tunnels at a nuclear test site in Punggye-ri in North Hamgyong Province, sparking concerns that it may be preparing for another nuclear test, government and military sources said Sunday.

   North Korea conducted its two previous plutonium-fueled nuclear tests, one each in 2006 and 2009, at the site.

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N. Korea's digging of tunnels sparks speculations about nuke test