LOCKWOOD, Mont. (AP) — Officials say an accidental, fast-moving fire at a Lockwood salvage lot destroyed about three dozen cars and a handful of campers.

Yellowstone County Sheriff's Office Detective Frank Fritz tells the Billings Gazette the fire at United Salvage, The Old Car Store on Saturday started when a person using a grinder on a car frame sparked a grass fire that quickly spread due to wind.

Lockwood Fire Capt. Robert Guenther estimates the damage to the cars alone to be more than $100,000.

Dave Demint of Billings says he owned 22 of the destroyed vehicles.