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In page Nikolai Ryzhkov:

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Following the Chernobyl disaster, along with Yegor Ligachev, Ryzhkov visited the crippled plant between 2–3 May 1986. On Ryzhkov's orders the government evacuated everyone within a 30 kilometres (19 mi) radius of the plant.[1] The 30 km radius was a purely random guess and it was later shown that several areas contaminated with radioactive material were left untouched by government evacuation agencies.[2]