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CONDON- A fire burning in the Bob Marshall Wilderness continues to spread slowly in the rugged country east of the Middle Fork of the Flathead, driven by strong winds and hot temperatures.

The lightning-caused Prisoner Lake Fire has been burning for almost two weeks in steep, rugged terrain. Fire crews have been working on the blaze with "full suppression", meaning they're fighting the fire instead of allowing it to burn on its own.

The fire has now burned more than 3.,400 acres and continues to "spot" as strong northerly winds drive embers beyond the existing perimeter of the fire. One of those spots is burning on the southwest flank of the fire near Junction Mountain on Lewis and Clark National Forest lands.

Several trails have been closed in the region, including the Molly Creek, South Fork of the White River, Haystack Mountain and Indian Creek.