With firefighters gaining the upper hand on a wildfire in Glacier National Park, investigators were looking into the possibility that the fire was caused by backcountry travelers.

The Reynolds Creek Fire was more than 60 percent contained Thursday morning, with mop-up occurring in some areas and aggressive air support working to knock down the flames in others. 

Glacier officials also said that "initial evidence" suggested the fire was man-caused. Any visitors who were hiking in the area of Reynolds Creek on the Gunsight Pass Trail or that may have been staying in or hiking through the Reynolds Creek Backcountry Campground between July 14 and July 21 were being asked to call 888-653-0009 or email [email protected] to discuss the fire.

Acreage consumed by the fire, at one point pegged at about 4,000 acres, has since been reduced to just shy of 3,200 acres.

The Rising Sun Motor Inn, Rising Sun Campground, and St. Mary Visitors Center remained closed to the public Thursday. The Going-to-the-Sun Road also remained closed from St. Mary to Logan Pass, although the pass was accessible from the west side of the park. However, visitors were encouraged to use the park shuttle due to congestion and limited parking at Logan Pass.

The Red Eagle Drainage was open for hiking access to Red Eagle Lake, Triple Divide, and the beaver ponds. St. Mary Lake Trail will remain closed due to the fire.