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Photo by: Gao Haorong

** FILE ** In this June 27, 2008, file photo released by China's Xinhua News Agency, the cooling tower of the Yongbyon nuclear complex is demolished in Nyongbyon, also known as Yongbyon, North Korea, in a sign of its commitment to stop making plutonium for atomic bombs. North Korea vowed Tuesday, April 2, 2013, to restart a nuclear reactor that can make one bomb's worth of plutonium a year, escalating tensions already raised by near daily warlike threats against the United States and South Korea. (AP Photo/Xinhua, Gao Haorong, File)

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