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DES MOINES, Wash. -- Firefighters say a boat fire on Puget Sound that injured two people spread from one fiberglass hull to another until 12 vessels were destroyed or damaged.

South King Fire and Rescue Assistant Chief Gordie Olson says a 28-year-old woman and a man in his 30s were taken to Harborview Medical Center in Seattle Sunday night with second- and third-degree burns to their upper bodies.

They were working in the bottom of a boat at the city of Des Moines marina, about 15 miles south of Seattle, when a flash fire erupted.

Olson says flames spread under the marina dock cover.

Worried boat owners raced to the marina after hearing about the fire in J dock. Heavy rain may have helped fire fighters who confined the flames to one dock and got them knocked down before they spread to dozens of other boats nearby.

I'm really thank God that we're alive and only the boat is gone, said boat owner Jean Mahon.

The cause of the fire remains under investigation, and there's no dollar estimate yet of the damage. The roof of the marina was severely damaged along with parts of the walkway. It may take several days before other boat owners in J dock can get inside to see or move their boats.

The vessels were sailboats and power boats 20 to 30 feet long.

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