Three South Korean soldiers were injured on Monday when an explosion occurred during a military operation inside the Demilitarised Zone (DMZ), the buffer strip that has separated the two Koreas since the 1953 armistice. The Joint Chiefs of Staff (JCS) in Seoul said the blast took place south of the Military Demarcation Line, the de facto border that runs through the middle of the zone.
Two of the injured personnel were evacuated by helicopter, while a third was initially transported by road before being airlifted to hospital, according to the JCS. The military did not immediately disclose the severity of their injuries or the exact nature of the operation.
In a statement, the JCS said the three soldiers “were injured by an explosion of unknown cause while conducting an operation at a location south of the MDL.” The cause of the blast remains unclear — it could have been a North Korean mine, a South Korean mine, or another explosive device. The area is among the most heavily fortified and mined frontiers in the world.
A border littered with explosives
The DMZ stretches about 248 kilometres (154 miles) across the Korean Peninsula and is roughly four kilometres (2.5 miles) wide. Although officially demilitarised, both its northern and southern edges are lined with barbed wire, tank traps, and millions of landmines. According to military data cited by Yonhap news agency, an estimated 800,000 mines are buried in and around the zone, many dating back to the Korean War, though mine-laying has continued in recent years.
Since 2024, North Korean leader Kim Jong-un has designated South Korea as his country's “principal enemy,” and Pyongyang's military has been actively laying new mines and constructing anti-tank barriers along the border in an effort to permanently seal it off. South Korean officials have previously reported that several North Korean soldiers were killed or wounded in accidental mine explosions during those works.
Landmine incidents have historically been a flashpoint between the two Koreas. In 2015, two South Korean soldiers were seriously wounded when a landmine exploded on the southern side of the DMZ, with one losing both legs. Seoul concluded that North Korean troops had crossed the demarcation line to plant the mines — an accusation Pyongyang denied. That incident prompted South Korea to resume anti-North Korean loudspeaker broadcasts along the border, a practice that has been periodically suspended and resumed depending on the state of inter-Korean relations.
The latest explosion comes at a time of heightened military tension on the peninsula, with North Korea continuing to test missiles and expand its border fortifications. South Korea's new leadership under President Lee Jae-myung has sought to keep diplomatic channels open with Washington and Pyongyang, as highlighted by Lee's recent appeal to former President Trump to maintain dialogue with the North. However, incidents like this underscore the persistent dangers along the world's most heavily armed border.
The JCS said an investigation is underway to determine the exact cause of the explosion. Meanwhile, the three injured soldiers are receiving medical treatment, and their families have been notified.
