The Pride of Iowa sandwich production plant in Marengo, IA was destroyed in a large fire that broke out at the facility on Saturday night.

After arriving at the incident at about 9 p.m., firefighters observed that the structure had become completely engulfed by flames, a local CBS News affiliate reported. Metal in the structure was reportedly so hot it had an orange glow.

Fire officials told KCRG that no workers were present when the fire ignited and that no injuries were logged during the incident. The television news station said the blaze is thought to have started in an office.

The building was declared a total loss, reports said. An investigation into the incident is ongoing.

Pride of Iowa manufactures pre-packaged sandwiches for convenience stores, vending machines, private label clients, and institutional customers, according to information on its website. The company’s USDA inspected facility in Marengo can produce up to 40,000 sandwiches per day.