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Source: Photo: Samsul Said/Bloomberg via Getty Images

SEOUL, South Korea. — A U.S. soldier is in North Korean custody after an unauthorized border crossing.

The soldier was being escorted back to the U.S. for disciplinary reasons, and somehow managed to slip through security and joined a UN tour of the demilitarized zone between North and South Korea.

UN Command said the troop crossed into North Korea without any authorization and witnesses tell CBS he was acting in a curious manner during the tour.

He has not been publicly identified and officials say they are working to resolve the situation.