Mesa County-Investigators with the Bureau of Land Management say a catalytic converter may be responsible for starting a fire that burned 843 acres of desert on the Utah-Colorado border near Mack, Wednesday.
After ruling out lightning and other natural causes, Public Information Officer for the Moab District Heather O'hanlon says investigators think brush became lodged in the undercarriage of a vehicle traveling in the desert.
That brush caught fire and was dislodged into dense grass. High winds then fanned the fire into an inferno that threatened a ranch and gas wells.
O'hanlon says firefighters will remain on the scene for a few more days to ensure no embers remain that could rekindle the fire.
The Bitter Fire is the largest fire of the year so far in the Grand Junction area.
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