U.S. Air Force A-10 attack aircraft wait to take off on the runway during their military exercise at the Osan U.S. Air Base in Pyeongtaek, south of Seoul, South Korea, Tuesday, April 2, 2013. North Korea vowed Tuesday 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/Bae Jung-hyun, Yonhap) KOREA OUT
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