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South Korea's presidential office said Friday it will continue taking necessary measures based on 'clear principles' in response to the land mine explosions in the Demilitarized Zone (DMZ) that seriously injured three people, according to Yonhap and KBS World. Top security adviser Wi Sung-lac reiterated the government's stance, with Yonhap reporting Seoul will keep acting on those principles. The Korea Times also quoted the adviser as reaffirming the government's position on the incident.