SEOUL, Nov. 2 (Yonhap) -- An Army staff sergeant was found unconscious with an unspecified injury at a front-line unit in the eastern border county of Cheorwon on Monday and later pronounced dead, military officials said.

Authorities were looking into the exact cause of the incident.

This undated illustration shows a military unit cordoned off. (Yonhap)

This undated illustration shows a military unit cordoned off. (Yonhap)

This undated illustration shows a military unit cordoned off. (Yonhap)