South Korea probes death of army sergeant near border with North Korea

South Korean authorities have opened an investigation after an army sergeant was found dead at a frontline unit near the border with North Korea.

• A South Korean army sergeant was found dead with external injuries at a unit in Cheorwon near the North Korean border on Monday.
• South Korea's defense ministry announced military and civilian investigators are examining the exact cause and circumstances of the death.
• Three South Korean soldiers were injured in landmine explosions south of the Military Demarcation Line on September 21.
• The South Korean military said North Korea planted those mines as part of border fortification since 2024, a claim Pyongyang denied.