South Korea calls for a formal apology from North Korea over the DMZ explosion that injured three soldiers.

South Korea’s military has demanded an apology from North Korea over landmine explosions earlier this month in the border zone between the two countries that wounded three soldiers.

Three South Korean soldiers were injured in two explosions on September 21 near the military demarcation line in the western section of the Demilitarized Zone, a heavily fortified border buffer zone between the Koreas that is commonly known as the DMZ.

Kang Hyunwoo, the South Korean joint chiefs of staff’s director of operations, said the military “strongly urges” North Korea to apologise for the blasts and take “responsible measures” to prevent a recurrence.

“This is a clear violation of the Armistice Agreement and undermines the spirit of existing inter-Korean agreements; it must be stopped immediately,” he said on Wednesday, adding “we strongly urge an apology and responsible measures”.

Defence Minister Kang Shin-chul said South Korea would consider unspecified “corresponding measures” if a complete investigation confirms the North was responsible.

Kim Yo Jong, the sister of North Korean leader Kim Jong Un, said the South Korean assessment is a “conspiratorial farce” and accused Seoul of making groundless claims to create a pretext for provocation against Pyongyang.

She also criticised the South for broadcasting warnings and firing warning shots at North Korean troops conducting front-line fortification work, adding “our soldiers have never crossed the border”.

“If the [South Korean] military gangsters fire at our soldiers carrying on the permanent project for the southern border, not warning shots, our border units will take immediate and merciless retaliatory action,” she said.

The United Nations Command said on Wednesday it had “identified an active Democratic People’s Republic of Korea (North Korea’s) anti-personnel mine on the ROK side of the Military Demarcation Line”, in a joint investigation with Seoul’s military.

“Based on the findings of the investigation, UNC determined that an Armistice Agreement violation occurred,” it added.

The UN Command is a US-led multinational military force charged with overseeing the armistice agreement that halted fighting in the Korean War and administers the southern side of the DMZ.