WEST POINT, Neb. (AP) — Federal officials are opening an investigation into an explosion and fire at a northeast Nebraska petroleum distribution center that left seven people injured.

The U.S. Department of Labor’s Occupational Safety and Health Administration says officials at its Omaha office will look into the Wednesday afternoon explosion at Sapp Bros. Petroleum in West Point. The agency says it will investigate whether there were safety violations at the facility and if it contributed to the incident.

OSHA says it hasn’t inspected the Sapp Bros. facility in West Point in the past five years, though it has issued citations for other company locations.

Two of the injured people were taken to the burn unit at an Omaha hospital.