Authorities say a firefighter responding to a fire in eastern Iowa has been hospitalized with a serious medical condition.

The Linn County Sheriff’s Office says the firefighter was one of several emergency responders trying to put out a large fire Thursday morning at a building in Central City that houses an oil recycling business. The firefighter was transported to nearby St. Luke’s Hospital.

A press release says the firefighter is being treated for a “possible life-threatening medical issue” but additional information was not released.

It took several hours to control the blaze. Information about the cause of the fire is not yet available.