A roughly 2.5-mile-long oil sheen was spotted Friday in the ocean water off the coast of Huntington Beach, but its source remained unknown. According to the Coast Guard, the slick is nearly 3 miles off the coast, near the oil platforms named Emmy and Eva. The slick was first reported at 6:50 p.m. Thursday, and Coast Guard vessels deployed in the water at daybreak Friday to investigate. "The Coast Guard is contacting all potential spill sources in the area, but no source has been identified," according to a USCG statement early Friday afternoon. "Additionally, the Coast Guard has hired an oil spill response organization to conduct offshore oil collection and is working to identify possible impacts to the shoreline and environmental protection strategies. FULL STORY: https://www.cbs8.com/article/tech/science/environment/oil-sheen-spotted-huntington-beach-coast/509-2ae0b283-2368-441f-931c-36bba1622b40