How many people died in the Russian nuclear submarine accident in November 2008?

An article in my towns newspaper said that over 20 were killed.

The accident occurred when a fire-extinguishing system went into operation in error aboard the submarine, Dygalo said. He said the dead included sailors and shipbuilders. The submarine was heading back to shore on its own power, and 21 people injured in the accident were evacuated to a ship that was escorting the sub. There were 208 people total aboard the vessel.