Chinese fishermen sell fish on the river bank of Dandong, China, opposite the North Korean border town of Sinuiju, on Thursday, Feb. 7, 2013. North Korea vowed last month to carry out its third nuclear test but has said nothing about timing. As a result, the building suspense in Seoul has prompted many to look at the dates Pyongyang has chosen for past atomic tests, as well as rocket and missile launches. (AP Photo/Eugene Hoshiko)

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