Russia investigates sub disaster
The K-152 Nerpa was carrying many more people than usual
An inquiry is under way into Saturday's gas poisoning on a Russian nuclear submarine in the Pacific that left 20 people dead, including 17 civilians.
Experts speculated that the presence of many civilians aboard during sea trials may have elevated the death toll.
But this has not been confirmed by officials investigating the accident.
The accident on the Nerpa, or Akula-class, attack vessel occurred during trials in the Sea of Japan.
Three seamen were among those killed in the accident, which happened in the nose of the submarine, officials said.
But the nuclear reactor, which is in the stern, was not affected and there was no radiation leak, Russian Pacific Fleet spokesman Igor Dygalo said.
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