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South Korea's Joint Chiefs of Staff said Tuesday it is investigating the overall border security operations of a military unit after a civilian crossed the Civilian Control Line and damaged a fence near the inter-Korean border, KBS World reports. The incident follows the apprehension of a woman in her 30s who made an unauthorized entry into a restricted front-line area in Cheorwon, Gangwon Province, and reached the barbed-wire fence, according to Yonhap and the Korea Times. The military is questioning the woman, whose identity has not been disclosed.