NORCO (AP) — Emergency officials in southeast Louisiana say a fire caused by an explosion at a plant that processes used cooking oil and other material into renewable diesel fuel has been extinguished. No injuries were reported.

The St. Charles Parish Emergency Operations Center reports on its website that fire crews responded to an explosion at the Diamond Green Diesel plant in Norco that occurred at about 9:30 p.m. Sunday. They say the production unit involved has been shut down.

Authorities said air monitoring crews in the area found nothing detectable, and no safety precautions were needed.

Diamond Green Diesel is a joint venture between a subsidiary of Valero Energy Corp. and Darling International Inc. Its website says it produces 9,300 barrels of renewable diesel a day.