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North Korea has sent a letter to the president of the U.N. Security Council (UNSC) calling last month's land mine blast near the border an incident "fabricated" by South Korea, Pyongyang's state media reported Monday, according to Yonhap and the Korea Times. This comes after South Korea sent its own letter to the UNSC urging North Korea to apologize and take responsibility for the blast, which injured three South Korean soldiers, as Yonhap and the Korea Times report. South Korean military authorities estimate North Korea has planted approximately 960,000 new landmines in and around the DMZ over the past two years, Business Korea reports.