DMZ Landmine Blast Deepens Korean Border Tensions

South Korea has demanded an apology from North Korea after landmine explosions in the Demilitarised Zone (DMZ) injured three South Korean personnel on 21 September. The blasts occurred on South Korea’s side of the border. Seoul said they were highly likely to have been caused by North Korean mines, and described the explosions as a violation of the 1953 armistice that halted active combat in the Korean War. It has called on Pyongyang to apologise and stop fortifying the border, while warning that it will take corresponding measures. North Korea denies responsibility. Kim Yo Jong, the sister of leader Kim Jong Un, called South Korea’s allegations groundless and accused Seoul of fabricating them as a political and military provocation. She denied that North Korean personnel had crossed the border to lay mines and warned that South Korea would pay for what she called a farce of its own making. She also referred to a 2015 landmine incident, in which two South Korean soldiers were maimed, claiming Seoul had used that event as a pretext to raise tensions. The DMZ is a four-kilometre-wide buffer zone created under the armistice and contains the Military Demarcation Line marking the border. Sporadic clashes and mine explosions have occurred there over the decades. The United Nations Command, which investigated the recent blasts with South Korea’s military, said it would address the alleged armistice violation through established mechanisms. It said it remained committed to enforcing the agreement, preserving stability and preventing escalation on the Korean Peninsula.

North Korea has denied South Korea’s accusation that North Korean mines caused an explosion in the Demilitarized Zone (DMZ) that injured three South Korean soldiers. Kim Yo Jong, sister of North Korean leader Kim Jong Un, said Seoul had produced false evidence and described its accusation as a “farce,” in remarks carried by North Korean state media, KCNA. South Korea investigated the blast. Defense Minister Kang Shin-chul said on Tuesday that North Korean mines caused it and that Pyongyang likely planted mines to reinforce the border. He warned that Seoul would take “corresponding” action, adding that the military had necessary measures available and would implement them in stages. South Korea’s military also called on North Korea to stop activities that raise tensions, apologize for the explosion, and take responsibility. South Korean and United Nations investigators reportedly found another North Korean mine during a follow-up inspection on Tuesday. South Korea’s Joint Chiefs of Staff said the investigation identified a North Korean anti-personnel mine on the Republic of Korea side of the Military Demarcation Line. The UN Command (UNC), which oversees the Korean armistice and administers the southern side of the DMZ, concluded that North Korea had violated the armistice agreement that ended fighting in the 1950–53 Korean War. The article reports the competing claims and the UNC’s finding but does not describe any further response from North Korea or detail what measures South Korea may take.

North Korea has denied South Korean findings that its land mines likely caused explosions that injured three South Korean soldiers near the Demilitarized Zone (DMZ). Kim Yo Jong, a senior North Korean official and sister of leader Kim Jong Un, called Seoul’s allegation a “conspiratorial farce” and accused South Korea of making groundless claims to justify military provocation. She warned that North Korean border units would retaliate immediately and “mercilessly” if South Korean forces fired on North Korean soldiers, distinguishing such action from warning shots. South Korea’s Joint Chiefs of Staff issued a preliminary assessment on Monday after an inspection with the US-led United Nations Command. The explosions occurred on September 21, about 10 metres south of the military demarcation line in the DMZ’s western sector. South Korean troops were clearing a rarely accessed, densely vegetated patrol route for possible future inspections after detecting terrain changes that might indicate North Korean mine-laying. The incident comes amid increased border tensions. North Korea has expanded frontline defenses, including mines and anti-tank barriers, and increased troop deployments near the DMZ. The 248-kilometre-long, four-kilometre-wide buffer zone is among the world’s most heavily fortified borders, with an estimated two million mines in and around it. The report compares the episode with a 2015 incident in which South Korea blamed North Korea for mine explosions that seriously injured two soldiers. That crisis brought military threats, weapons demonstrations and renewed propaganda broadcasts before negotiations eased tensions; North Korea expressed regret but did not clearly accept responsibility. Relations have deteriorated further since early 2024, as Pyongyang has characterized South Korea as a permanent enemy, adopted a hostile two-state framework and rejected US calls to resume talks unless Washington drops denuclearisation as a precondition.