A fire ignited at Iowa Select Farms Tuesday night. The fire was fed by a 20,000-gallon propane tank, Hergenreter said.

And at 10:35 p.m., six firefighters from the Region V Hazardous Materials Response Team, headquartered in Fort Dodge, were called to the scene, 2620 Upland Ave.

“That’s an extremely dangerous situation,” Hergenreter said. “The danger of having pressure build up and having an explosion.”

Rockwell City firefighters isolated a one-mile area around the fire before calling Hazmat.

Hergenreter said if a tank were to explode in that situation, it would have been a hazard area of one mile.

“The Rockwell City Fire Department did a great job of following their training and calling the Hazmat team,” Hergenreter said.

Once the Hazmat team arrived, Rockwell City firefighters used a drone, which helped Fort Dodge firefighters assess the situation.

Hergenreter said the vaporizer associated with the tank was where the fire was. The cause of the fire starting is not known.

“Hazmat went in and did an assessment of the pressure of the tank and then they went in underneath the tank to close the valve off,” Hergenreter said. “The closing of the valve didn’t take long, but it was more of an assessment. We didn’t want first responders anywhere close if it was going to have a violent rupture. The drone helped them feel a little more confident and they had to get right up close to the tank and close the valve.”

No one was injured.

“It was a very high-risk type fire,” Hergenreter said. “All their first responders and the Hazmat team did a good assessment and closed the valve down. It ended safely with such a high-risk event.”

The Hazmat team returned to Fort Dodge at about 1:30 a.m.

Calhoun County sheriff’s deputies and Calhoun County emergency management also responded.