PORT HADLOCK, Wash. (AP) — A Navy destroyer caused an oil spill in Port Townsend Bay. Emergency crews have begun a containment and cleanup effort. The USS Gridley was leaving the pier at Naval Magazine Indian Island on Thursday morning when the oil spill occurred around 10:30 a.m. Naval officials said 20 gallons were spilled. Crews were using a 200-foot oil spill containment boom to form a perimeter and limit environmental damage. About 10 gallons have been contained. The Navy notified the Coast Guard and the state’s Department of Ecology. Naval officials are investigating the cause of the spill.