Editor's Note: This article originally appeared on Business Insider.

The Russian military successfully launched an intercontinental ballistic missile from its new Borei A-class submarine, the nuclear-powered Knyaz Vladimir, or Prince Vladimir, according to TASS, Russia's state-run news agency.

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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. 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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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)

It's been more than a week since a mysterious Russian nuclear accident roughly 600 miles north of Moscow and only the Kremlin and those killed know what happened.

What is known is something exploded on Aug. 8 at a naval weapons testing range near the village of Nyonoksa. The Russian government's official account of the accident has changed several times since then, but the country's weather agency recently confirmed that radiation levels jumped to 16 times greater than normal after the blast.

U.S. media outlets have reported that a nuclear-powered cruise missile named the SSX-C-9 Skyfall likely exploded during testing. President Donald Trump appeared to confirm as much when he tweeted on Aug. 12 that the United States had gleaned useful information from "the failed missile explosion in Russia."

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