U.S. Air Force B-2 stealth bomber flies over near Osan U.S. Air Base in Pyeongtaek, south of Seoul, South Korea, Thursday, March 28, 2013. A day after shutting down a key military hotline, Pyongyang instead used indirect communications with Seoul to allow South Koreans to cross the heavily armed border and work at a factory complex that is the last major symbol of inter-Korean cooperation. (AP Photo/Shin Young-keun, Yonhap)
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