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Reporting by a US-based researcher in August 2019 showed that the plant was leaking waste materials, leading to health concerns over those that live near the plant and fears that the pollution would travel down the Ryesong river to South Korean waters. The leaks were independently verified by 38 North. On 28 August 2019, the South Korean Ministry of Unification announced that testing of a portion of the Han River along the Northern Limit Line was underway to determine the level of pollution and if any substantial radiation risk existed.