(CNN) -- An air tanker crashed while fighting a fire in western Utah on Sunday, killing two pilots, a spokesman for local authorities said.
The crash took place near the Utah-Nevada state line, said Detective Sgt. Jody Edwards, a spokesman for the Iron County, Utah, sheriff. When it went down, the tanker was on its second run of the day fighting the White Rock Fire, and was loaded with about 1,600 gallons of fuel and 2,000 gallons of water and fire retardant, he said.
It was not immediately known what caused the crash, which took place in steep, mountainous terrain.
The plane was owned by Neptune Aviation Services of Missoula, Montana.