Fire Chief Butch Fidler said he believes gasoline was used, rather than diesel fuel, which is usually used when conducting burns.
Fidler said the gas vapors ignited, and flames hit the firefighters. He did not release the firefighters' names, pending notification of relatives.
Fidler said one firefighter was transported to Jennie Edmundson Hospital for treatment and then released.
The other was taken to Creighton Medical Center and flown by air ambulance to the St. Elizabeth Hospital Burn Unit in Lincoln, Neb., he said.
"We heard from (the hospital) last night, and they said he suffered second- and third-degree burns," Fidler said. He said the hospital indicated the firefighter should be released in three to five weeks.
"He's going to be OK. I was more concerned with his airway as the flames flashed into his face," the chief said.
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