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On a large television screen in front of Pyongyang's railway station, a North Korean state television broadcaster announces the news that North Korea conducted a nuclear test on Tuesday, Feb. 12, 2013. North Korea conducted a nuclear test at an underground site in the remote northeast Tuesday, taking an important step toward its goal of building a bomb small enough to be fitted on a missile that could reach United States. The TV screen text reads "Korean Central News Agency reports," and "The third underground nuclear test successfully conducted." (AP Photo/Jon Chol Jin)

Associated Press
On a large television screen in front of Pyongyang's railway station, a North Korean state television broadcaster announces the news that North Korea conducted a nuclear test on Tuesday, Feb. 12, 2013. North Korea conducted a nuclear test at an underground site in the remote northeast Tuesday, taking an important step toward its goal of building a bomb small enough to be fitted on a missile that could reach United States. The TV screen text reads "Korean Central News Agency reports," and "The third underground nuclear test successfully conducted." (AP Photo/Jon Chol Jin)
On a large television screen in front of Pyongyang's railway station, a North Korean state television broadcaster announces the news that North Korea conducted a nuclear test on Tuesday, Feb. 12, 2013. North Korea conducted a nuclear test at an underground site in the remote northeast Tuesday, taking an important step toward its goal of building a bomb small enough to be fitted on a missile that could reach United States. The TV screen text reads "Korean Central News Agency reports," and "The third underground nuclear test successfully conducted." (AP Photo/Jon Chol Jin)
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