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The Museum Fire began July 21 and burned 1,961 acres on the Coconino National Forest above Flagstaff. (USFS/photo)

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Fire investigators: Museum Fire caused by forest thinning efforts

The Forest Service announced preliminary results of the investigation into the cause of the Museum Fire, a wildfire which began July 21 and burned 1,961 acres on the Coconino National Forest above Flagstaff.