North Korean soldiers stand guard as U.S. State Department's top Korea specialist Sung Kim, right, greets an unidentified North Korean official as Kim arrives at the border village of Panmunjom in the demilitarized zone that separates the two Koreas, South Korea, to cross the border while carrying box loads of documents detailing activity at North Korea's key nuclear reactor a Saturday, May 10, 2008. Kim traveled Saturday back to South Korea by land after collecting approximately 18,000 secret papers during a three-day visit to Pyongyang. (AP Photo/ Lee Jin-man)

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