South Korea has warned of “appropriate, substantial and corresponding” measures if an ongoing investigation confirms that a recent explosion inside the Demilitarized Zone (DMZ) was caused by a land mine planted by North Korea.South Korean Defence Minister Kang Shin-chul made the remarks on September 28 as investigators continued examining the blast that seriously injured two South Korean soldiers last week. A third soldier suffered minor injuries.Key HighlightsSouth Korea has warned of corresponding measures if North Korean responsibility is confirmed.The DMZ blast occurred on September 21 during a route-clearing operation.Two South Korean soldiers were seriously injured and another suffered minor injuries.Soldiers reported seeing an object resembling a North Korean wooden-box mine.The military has not yet confirmed the type or origin of the device.South Korean forces and the UN Command have begun a joint investigation.Forensic analysis of mine fragments and other evidence is underway.What Happened in the DMZ Blast?The explosion occurred on September 21 inside the DMZ, south of the Military Demarcation Line, as South Korean troops were clearing a route for a planned inspection by the United Nations Command.The incident involved two explosions. Two military personnel suffered serious injuries, while another soldier sustained minor injuries. The seriously injured soldiers were taken to hospital for treatment.The location is considered a potentially dangerous area because of the presence of land mines and the fact that South Korean troops have not routinely entered parts of the area for decades.Why Is North Korea Being Investigated?The South Korean military initially suspected that the blast could have been caused by North Korean land mines.On Monday, Joint Chiefs of Staff officials said some soldiers reported seeing an object near the blast site that resembled a North Korean wooden-box mine. However, other accounts described the object differently, meaning investigators have not yet established its exact type or origin.A wooden-box mine is a type of anti-personnel mine historically used by North Korean forces. South Korean officials have stressed that the soldiers' observations alone are not enough to conclusively establish responsibility.South Korea Begins Joint DMZ InvestigationThe South Korean military and the United Nations Command began a joint investigation of the blast site on September 27.A survey team of around 40 personnel reached the vicinity of the suspected explosion site but was unable to reach the exact location of the blast during the initial operation. Further investigation is planned.Investigators are collecting physical evidence, including mine fragments and explosive residue. The National Forensic Service is also examining evidence recovered from the scene and from the injured soldiers' protective equipment.Defence Minister Kang Shin-chul’s StatementDefence Minister Kang Shin-chul said South Korea would take appropriate measures if the investigation confirms that the blast was caused by a recently planted North Korean mine.At the same time, Kang stressed that the evidence currently available is not conclusive. He said some accounts indicated that the device may not have been a wooden-box mine and that the government would provide a transparent explanation once the investigation establishes the facts.Kang also rejected allegations that the military had deliberately delayed the investigation or attempted to conceal information about the incident.What Happens Next?The investigation will focus on identifying the explosive device, determining whether it was a land mine and establishing its origin.Forensic findings and evidence from the blast site will be important in determining whether North Korea was responsible. The military has said it is keeping all possibilities open while the investigation continues.Until the investigation is completed, South Korean officials have not officially attributed the explosion to North Korea.The incident comes amid continued military tensions on the Korean Peninsula, making the findings of the DMZ investigation significant for Seoul's next steps.