UNC and South Korea Conclude North Korean Mine Caused DMZ Blast

The United Nations Command and South Korea’s investigation found an active North Korean mine on the South Korean side of the Military Demarcation Line and concluded that the Sept. 21 blast violated the Armistice Agreement. South Korea’s military assessed that North Korean mines were highly likely to have caused two explosions in the western Demilitarized Zone, injuring three South Korean soldiers, two critically; an unexploded mine was also reported nearby. President Lee Jae Myung ordered a thorough investigation and said South Korea would decide on measures based on its findings, including possible renewed border loudspeaker broadcasts or action through the UNC. North Korea denied responsibility, called the findings fabricated and threatened retaliation, raising tensions and complicating Seoul’s pursuit of dialogue.
The JCS said there were no records of South Korean mines being laid in the area, while signs that North Korean troops had laid mines nearby were detected in September 2025. Forensic analysis also found TNT and brown-colored foreign material on recovered protective equipment, but no metal fragments—an absence the military said weighed against the explosions being caused by South Korean antipersonnel mines.
The military said the blasts occurred about 10 metres south of the Military Demarcation Line, near terrain changes in an area where North Korean forces were believed to have recently planted mines.
A South Korean security expert described renewed border loudspeaker broadcasts as a way to pressure Pyongyang, saying they can be “extremely painful” for the regime because North Korean authorities are sensitive to outside information reaching troops and residents. He noted that broadcasts after the 2015 mine incident were followed by heightened tensions and inter-Korean talks.
The joint investigation team initially could not reach the blast site to collect debris and other evidence, ending its attempt after clearing a path close to the area. Investigators said recovering the reported unexploded mine would be important to establishing the type of mine involved.
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