North Korean children accompanied by their grand parents, roller-skate at Kim Il Sung stadium in Pyongyang, North Korea, Wednesday, Feb. 13, 2013. One day earlier, North Korea conducted an underground nuclear test in the far north of the country, its third since 2006. (AP Photo/Jon Chol Jin)

Associated Press
North Korean children accompanied by their grand parents, roller-skate at Kim Il Sung stadium in Pyongyang, North Korea, Wednesday, Feb. 13, 2013. One day earlier, North Korea conducted an underground nuclear test in the far north of the country, its third since 2006. (AP Photo/Jon Chol Jin)
North Korean children accompanied by their grand parents, roller-skate at Kim Il Sung stadium in Pyongyang, North Korea, Wednesday, Feb. 13, 2013. One day earlier, North Korea conducted an underground nuclear test in the far north of the country, its third since 2006. (AP Photo/Jon Chol Jin)
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