A Magone Marine boat sank in Unalaska Thursday morning, spilling a small amount of diesel fuel. Coast Guard Lt. Jim Fothergill says it’s not clear why the landing craft JOSHUA sank while tied up at the dock. The vessel leaked 10 gallons of diesel into the water before Magone personnel were able to stop the spill. There are still 750 gallons of fuel inside the landing craft.

Magone personnel will try to refloat the JOSHUA Friday afternoon. Fothergill says the Coast Guard will be on hand to supervise that operation. The agency is investigating the cause of the sinking.