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North Korea has sent a letter to the president of the U.N. Security Council claiming the September DMZ mine blast that injured three South Korean soldiers was a fabrication by Seoul, Yonhap reports. This comes after South Korea sent its own letter to the UNSC on Oct. 22-23 urging Pyongyang to apologize and take responsibility for the blast, which Seoul says violated the Korean War Armistice, according to Yonhap, Korea Times, and KBS World. KBS World also reports North Korea is believed to have planted nearly one million land mines in the DMZ over the past two years. Korean media coverage focuses on the diplomatic exchange, with foreign ministry spokesperson Park Doo-soon confirming Seoul's letter, but no Korean public reaction is documented in the supplied material.