MOSCOW — Russia's Ministry of Defense says 14 sailors were killed when a nuclear-powered submarine caught fire while it was underwater last week.<br /><br />The vessel was a AS-12 Losharik submarine, Russian media outlet RBC reports, citing anonymous sources. <br /><br />The AS-12 can reach depths of up to 6,000 meters. Its nuclear reactor is isolated and operates autonomously.<br /><br />The vessel is carried beneath the hull of the nuclear-powered submarine Orenburg to avoid detection, according to Russian newspaper Novaya Gazeta. <br /><br />Russian News Agency TASS cited a statement by the Russian Ministry of Defense as saying that the submarine was in Russian territorial waters and was studying the seafloor. <br /><br />The statement added that the sailors died as a result of inhaling combustion products on the vessel.<br /><br />The exact cause of the fire is unknown.<br /><br />Russia's President Vladimir Putin cancelled a planned visit and extended condolences to the family members of the victims, RBC reports. <br /><br />According to TASS, President Putin ordered a thorough investigation to determine the cause of the submarine fire.
