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Twenty Russian sailors were killed in a deadly nuclear submarine incident, Russian officials reported Sunday. As Reuters notes, "Prosecutors investigating the latest incident said they suspected the victims died after inhaling a toxic gas used as a fire suppressant when the vessel's fire extinguishing systems went off unexpectedly. It was not clear why the portable breathing gear usually issued to Russian submarine crews did not save them." The last major Russian submarine disaster came aboard the Kursk, in 2000, when more than 100 sailors died.