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A 140-foot tug containing 50,000 to 60,000 gallons of diesel fuel has capsized and sunk at an Everett shipyard. The Coast Guard and Washington Department of Ecology are monitoring the site in case the fuel starts to leak.

The tug was on a 200-foot section of dry dock that began sinking at the Vigor Marine Shipyard on Saturday. Both the dry dock and the tug are partially submerged, with the tug — named the Invader — capsized on its starboard side.

A boom has been placed around the perimeter of the scene to contain any leaks, the Coast Guard reported, and a salvage company is working to plug the tug’s vents. ┬áThe cause of the sinking has not been determined.