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Story summary
- Three South Korean military officers were injured by an explosion inside the Demilitarized Zone on Monday.
- South Korean officials said the blast cause was unclear and did not confirm a North Korean mine.
- Two officers were airlifted by helicopter while the third was first moved by land then airlifted.
- The officers are treated at a military hospital near Seoul; the DMZ spans 248 km by 4 km with about two million mines.
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