A joint South Korean and U.N. Command team investigating the western Demilitarized Zone blast has found another North Korean anti-personnel mine near the explosion site, adding a new piece of physical evidence to an incident that has become both a troop-safety issue and an armistice question. Military officials said the newly identified device was a plastic anti-personnel mine located about one meter behind one of the blast craters. Combined with two explosion craters and another mine soldiers said they saw earlier, investigators now believe at least four mines were concentrated within a small area.
The location is central to the case. South Korean military officials and the U.N. Command agreed that the newly found mine and the two blast points were south of the Military Demarcation Line. One military account placed the accident site about ten meters inside the southern side. That means the inquiry is no longer focused only on what type of mine exploded. Investigators are also examining how multiple North Korean devices came to be positioned on the South Korean side of the line.
Placement becomes the key question
South Korean officials say the pattern points away from an accidentally drifted mine. Defense Minister Kang Shin-chul told lawmakers that the devices appeared to have been placed rather than washed or moved into the area, citing their concentration and condition. Military engineers described the newly found mine as partially buried by roughly three centimeters. U.N. Command specialists used slightly different language, saying the device appeared to have been deliberately positioned and covered with vegetation rather than fully buried. Both sides nevertheless agreed on its location south of the line.
The military also linked the site to North Korea's broader fortification work along the border. Since 2024, North Korean units have expanded fences, barriers, roads and minefields near the demarcation line as part of what Pyongyang describes as strengthening its southern border. South Korean officials say some of that work has repeatedly crossed or approached the line, and they are now examining whether the mines near the blast site were connected to those operations.
Seoul is waiting on the final attribution
The political and military response is still being calibrated. President Lee Jae Myung ordered a transparent investigation and said any response should follow verified findings. The Defense Ministry has gone further, saying that if North Korean responsibility is confirmed, the incident would constitute a clear armistice violation and South Korea would take corresponding measures. The presidential office has so far avoided announcing specific steps while the investigation remains open.
That caution reflects unresolved technical questions. The U.N. Command is responsible for judging whether the armistice was violated, while South Korea's military and forensic agencies are examining the explosive evidence and possible hostile intent. Officials said the latest on-site investigation has ended, but laboratory analysis and the broader joint review will continue. The outcome will determine both how Seoul characterizes the incident and whether patrol, route-opening and mine-detection procedures in similar parts of the DMZ need to change.