In August of this year, Western media reported on a mysterious explosion that took place in a weapons research site located near Severodvinsk. The explosion allegedly happened during testing of a top-secret prototype rocket engine. Russian authorities revealed that five workers died as a result of the explosion, but denied media reports that the explosion had caused a radiation leak that had affected Severodvinsk. The Russian Ministry of Defense also denied allegations that a large-scale nuclear clean-up operation had been conducted in and around Severodvinsk. At the same time, Russian authorities restricted maritime traffic in the White Sea, on the shores of which Severodvinsk is situated.

On Wednesday, the Russian news agency Interfax reported that three American diplomats had been detained by authorities near Severodvinsk, allegedly because they tried to enter the city without the necessary permits. The diplomats were not named but are believed to be military attachés that serve in the United States embassy in Moscow. Interfax said the three were detained on Monday while onboard a passenger train. They were removed from the train, questioned and eventually released. However, they might still face charges of trying to enter a restricted area without permission.

The United States Department of State issued a statement claiming that the three diplomats “were on official travel and had properly notified Russian authorities of their travel”. A State Department spokesman said on Wednesday that the three diplomats’ travel plans had been authorized by the Russian Ministry of Defense. But authorities in Russia said that the three military attachés had been authorized to travel to the city of Arkhangelsk, which is located approximately 30 miles east of Severodvinsk. “We are quite willing to provide the United States embassy with a map of the Russian Federation”, the Russian statement concluded.