A 52-foot recreational boat caught fire and sank about 20 miles off the coast of Washington, but the three people on board were rescued by the crew of a nearby fishing vessel, the U.S. Coast Guard said. No one was injured.

The boat, the “Miss Kelly”, sank about 20 miles northwest of Grays Harbor, the Coast Guard said. It was not immediately known what caused the fire.

The boat sank with about 600 gallons of diesel on board, the Coast Guard said. Three fuel tanks remain floating on the surface. A light sheen was also visible on the surface where the vessel sank, the Coast Guard said.

Coast Guard pollution investigators contacted the National Oceanic and Atmospheric Administration for an air plume model to assess potential air pollution headed to shore.