(Warrenton, OR)  --  The U.S. Coast Guard says a sunken fishing boat is leaking fuel in the Columbia River.  The boat sank yesterday near the mouth of the river.  The boat was leaking diesel fuel and it is unknown just how much fuel is on board.  Crews in the marina used an oil containment boom around the boat.  No one was apparently on the boat when it sank.  The investigation is ongoing.