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. The Aug. 8, 2019, explosion of a rocket engine at the Russian navy's testing range just outside Nyonoksa led to a brief spike in radiation levels and raised new questions about prospective Russian weapons. (AP Photo/Sergei Yakovlev)

Editor's Note: This article originally appeared on Radio Free Europe/Radio Liberty

Three U.S. diplomats have been removed from a train and briefly questioned by Russian authorities in the sensitive Arctic shipyard city of Severodvinsk, near the site of a mysterious explosion in August that killed five nuclear workers.

Russia's Interfax news agency reported on October 16 that the diplomats were taken off the train that runs between Severodvinsk and Nyonoksa around 6 p.m. on October 14.

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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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