GREELEY, Colo. — Authorities say three maintenance workers were burned in a fire at an oil site in northern Colorado.

The Weld County Sheriff’s Office says two of the men were airlifted to a hospital and one was taken by ambulance after the fire broke out northeast of Greeley on Thursday afternoon. Their conditions have not been released, and investigators have not said what caused the blaze.

The fire is being classified as an industrial accident, and the investigation has been turned over to the Briggsdale Fire Department.

No other information was released.

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