Firefighters were dispatched to the Hero BX Iowa Biofuels plant in Clinton, IA early Wednesday morning after receiving a report of an explosion and fire at the facility, according to a report in the Clinton Herald.

Called to the site at about 4:15 a.m., crews saw flames that extended about 60 ft from a corner of the building, the newspaper said. Employees evacuated the facility without injury.

The company expressed concerns that flames could reach a methanol tank on site, but firefighters managed to prevent the fire from spreading, officials told the Herald. Crews cleared the scene by 8:45 a.m.

Hero BX’s biodiesel plant in Clinton has an annual capacity of 10 million gal, according to information on the firm’s website.