BRUNSWICK, Ga.—Health officials warned swimmers and fishers to be on the lookout for oil sheens off two Georgia islands after oil spilled from an overturned cargo ship while crews were dismantling it. The Coastal Health District issued the alert Thursday for the waters off Jekyll and St. Simons islands hours after a large amount of oil from the nearby Golden Ray escaped a barrier around the ship. The oil leaked while crews were cutting away a fifth section of the ship, which capsized in September 2019 with about 4,200 automobiles in its cargo decks. Roughly half the ship remains partially submerged off St. Simons Island, about 70 miles (112 kilometers) south of Savannah. Crews used absorbent boom and oil skimmers to capture spilled fuel. Officials have said it’s hard to estimate how much fuel spilled. The health district said swimmers and fishers should avoid areas with visible oil sheens, and …