WILLARD, Utah (AP) — A Chevron fuel spill near a northern Utah bird refuge is much worse than originally thought as up to 27,000 gallons might have leaked, authorities said.

A split in a pipeline that runs from Salt Lake City to Spokane, Wash., is suspected of releasing diesel fuel into soil and marshes at Willard Bay State Park, according to the U.S. Transportation Department’s Pipeline and Hazardous Materials Safety Administration.