The letter, dated October 22 and signed by South Korean Ambassador to the UN Jihoon Cha, was registered as Security Council document S/2026/836.
Seoul said the September 21 explosions occurred south of the Military Demarcation Line (MDL) inside the Demilitarized Zone (DMZ), injuring three soldiers, two seriously.
Citing final findings announced by South Korea's Joint Chiefs of Staff on October 5, the letter said a joint investigation with the United Nations Command (UNC) and forensic analysis confirmed that North Korean forces had deliberately planted resin-cased anti-personnel mines.
The two blast sites and an additional mine were found approximately 10 meters south of the MDL.
"The investigation also ruled out accidental displacement as the likely cause," the letter said, adding that North Korean forces had deliberately planted the mine south of the boundary.
Seoul said the mine-laying violated the 1953 Korean War Armistice Agreement, citing a UNC determination issued on September 30.
The government urged Pyongyang to halt activities that heighten tensions, apologize, remove mines planted in violation of the armistice and take steps to prevent further incidents.
The letter also rejected North Korea's characterization of South Korean military operations along the MDL as "provocations."
Seoul described its warning broadcasts and warning shots as "legitimate and defensive measures" intended to prevent North Korean troops from crossing the MDL and ensure their withdrawal if they did.
North Korea sent a separate letter to the Security Council on Oct. 25, denying responsibility for the mine explosions and accusing Seoul of violating the UN Charter through its warning shots, according to North Korean state media.
Although Seoul sought to draw the Security Council's attention to the incident, its letter did not request a meeting, presidential statement or other specific action.
Instead, the government asked for the letter to be circulated as an official Security Council document, placing its findings and justification for border operations on the UN record.
Copyright ⓒ Aju Press All rights reserved.
