It is reported by CNBC with reference to sources familiar with US intelligence.
"It was not a new launch of weapons, it was a recovery mission to save a lost missile from a previous test," the source said.
According to another CNBC interlocutor, an explosion occurred on one of the ships that participated in the special operation, which caused a reaction in the rocket core.
"An explosion occurred on one of the vessels participating in the restoration, which caused a reaction in the rocket core, which led to a radiation leak," the source said on condition of anonymity.
At the same time, the US intelligence report does not mention potential health and environmental risks caused by damage to the rocket's nuclear reactor.
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As reported, the explosion in the Arkhangelsk region of Russia became known on August 8. On the night of August 10, the Russian state corporation Rosatom announced that a rocket exploded during the tests, in the engine of which a radioactive isotope power source was used. The Russian Ministry of Defense stated in the first report that no harmful substances had entered the atmosphere.
At the same time, the civil defense department of the administration of the city of Severodvinsk reported that the sensors located in the city limits recorded a short-term increase in the radiation background.
The jump in radiation after the event was reported in the administration of the city of Severodvinsk, but subsequently the mayor's office deleted the message.
The explosion killed at least five people.