This photo taken on Oct. 7, 2018, shows a billboard that reads "The State Central Navy Testing Range" near residential buildings in the village of Nyonoksa, northwestern Russia. (Associated Press/Sergei Yakovlev)

A mysterious explosion at a Russian weapons testing site earlier this month released various radioactive isotopes, creating a cloud of radioactive gases that swept across a nearby town, the country's state weather agency revealed Monday, and experts said the mixture removes all doubt about what exactly blew up earlier this month.

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