In this photo provided by the Santa Barbara County, Calif., Fire Department, Henry Duncan, left, and Bob Seiler, legs covered in oil, foreground, stand in the Goleta Beach parking lot with their oil-covered kayaks, on the truck at rear, in Goleta, Calif., Wednesday, July 29, 2015. The pair encountered a large oil sheen and called the fire department to investigate. The Coast Guard is investigating this new oil slick off the Southern California coast about a dozen miles from where a broken pipeline spilled thousands of gallons of crude into the ocean in May. (Mike Eliason/ Santa Barbara County Fire Department via AP)
GOLETA, Calif. (AP) — Beachgoers were warned to avoid tar balls on Thursday along the Santa Barbara shoreline as the Coast Guard sought the source of a mysterious miles-long oil slick that floated up 1,000 yards from the sand.