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Investigators have determined the cause of the large fire continuing to burn in South Central Utah today.
One investigator says a spark from a four-wheeler started the blaze, which has now burned 65-hundred acres in the mountains near Hanksville.
A national response team still has not been able to contain the fire due to shifting winds and dangerous conditions.
Several structures remain threatened including a communications tower that provides phone service to the town of Caineville.