Two consecutive explosions inside the demilitarised zone (DMZ) on Monday, 22 September 2025 critically injured two South Korean soldiers, with forensic analysis now under way on mine fragments collected from the blast site to determine whether they are of South Korean or North Korean origin, a military official confirmed on Wednesday. The incident occurred south of the Military Demarcation Line (MDL), the heavily fortified boundary separating the two Koreas, as speculation over potential North Korean involvement continues to grow.

How the Blasts Unfolded

A team of 18 personnel — comprising 15 officers and noncommissioned officers and three conscripts, including combat engineers — had been deployed to clear a route for a UN Command (UNC) inspection into North Korea's suspected mine-laying activities, originally scheduled for early next week.

'Two explosions occurred in total. Around 10.50 am, a staff sergeant was injured in the first blast, while the battalion commander was injured in a second blast that occurred when he approached the staff sergeant to administer first aid at the scene,' a military official told reporters, citing initial statements from the soldiers.

According to those initial statements, the blasts took place as the team was returning after completing a route-clearing operation, while sweeping through waist-high grass along a completely new path — conditions that officials acknowledged made buried mine detection especially difficult.

Injuries and Evacuation

The battalion commander suffered a severe injury to his ankle, while a noncommissioned officer sustained a leg fracture, according to military officials. A rescue helicopter deployed a hoist to airlift both critically wounded soldiers from within the DMZ, transporting them to a military hospital in Seongnam, just south of Seoul.

The remaining 16 personnel — including a third soldier with a minor injury — moved on foot south of the general outpost fence for initial medical checks before being airlifted to the same hospital in eight separate helicopter flights. The two critically injured soldiers have since undergone surgery and are recovering; another soldier with minor injuries remains hospitalised, while the other 15 have been discharged following thorough medical evaluations.

Forensic Investigation and North Korean Angle

Forensic analysis of mine fragments recovered from the scene is under way, with preliminary findings expected to be released after next week. Officials are keeping all possibilities open, including North Korean involvement. The blast site is located between the MDL and South Korea's forward fences, in an unspecified location closer to the heavily fortified border.

'We are keeping all possibilities open in our investigation and will take all necessary measures in response,' the official said. Notably, the investigation follows a broader UNC-led effort to assess North Korea's suspected mine-laying activity along the DMZ — a pattern that has raised alarm among Seoul's defence planners in recent months.

Body cameras worn by two of the deployed soldiers captured only dense grass in initial footage reviews, meaning investigators will need to return to the site near the MDL for an on-site examination. The military has said it will not rush the process, ensuring affected soldiers receive appropriate post-traumatic care and complete safety rehearsals before returning to assist the inquiry.

Safety Protocols and Next Steps

Asked whether adequate safety measures were in place, the official confirmed that every soldier on the mission had worn protective suits and mine boots. Following the blasts, the military notified North Korea via live broadcasts and through the UNC channel.

Preliminary forensic findings are expected to shape the next phase of the investigation, and will likely influence the scope and timeline of the rescheduled UNC inspection into North Korean mine-laying activities along the DMZ.