South Korean army soldiers patrol along a barbed-wire fence at the Imjingak Pavilion, near the demilitarized zone of Panmunjom, in Paju, South Korea, Tuesday, Feb. 12, 2013. South Korea is confirming that North Korea has tested a nuclear device in defiance of U.N. orders to stop building atomic weapons. (AP Photo/Ahn Young-joon)

Associated Press
South Korean army soldiers patrol along a barbed-wire fence at the Imjingak Pavilion, near the demilitarized zone of Panmunjom, in Paju, South Korea, Tuesday, Feb. 12, 2013. South Korea is confirming that North Korea has tested a nuclear device in defiance of U.N. orders to stop building atomic weapons.  (AP Photo/Ahn Young-joon)
South Korean army soldiers patrol along a barbed-wire fence at the Imjingak Pavilion, near the demilitarized zone of Panmunjom, in Paju, South Korea, Tuesday, Feb. 12, 2013. South Korea is confirming that North Korea has tested a nuclear device in defiance of U.N. orders to stop building atomic weapons. (AP Photo/Ahn Young-joon)
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