ST. LOUIS (AP) -- State environmental officials are investigating a possible oil or gas leak after a tugboat sank on the Mississippi River near St. Louis.
The Missouri Department of Natural Resources said in a news release that workers on the scene have reported a sheen on the water.
The boat was carrying 8,575 gallons of diesel when it became grounded Wednesday on the Missouri side of the river.
The owner of the boat is a St. Louis-based shipping company called American River Transportation Co. It's owned by Decatur, Ill.-based agribusiness giant Archer Daniels Midland Co.
DNR officials say public drinking water sources downstream from the sunken vessel have been notified.
Petty officer Travis Addison of the U.S. Coast Guard says an investigation is being conducted to determine what caused the boat to take on water.