Crews were called to Heartland Petroleum, located at 4001 East 5th Avenue, on the city's east side, around 10:30 p.m., 10TV News reported.

An oil tank at the business was on fire.

Employees were evacuated and no injuries were reported.

Firefighters said crews were transporting warm oil when some of it spilled near a hydrogen tank, blowing out a gasket, and causing a pipe to catch fire.

"I think it's just a natural hazard that can occur when you're moving hot oil around and you're moving this around," said Battalion Chief Michael Fowler. "There's safeties and everything to shut everything down. There are release valves for everything, but accidents are going to occur."

The Environmental Protection Agency is expected on scene to investigate the incident on Sunday.

Heartland Petroleum is an oil recycling and sales company, according to its Web site.

Watch 10TV News HD and refresh 10TV.com for additional information.

©2010 by 10TV.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.