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Cascade, Idaho • Residents in rural north-central Idaho have been told to be ready to evacuate due to a 2-square-mile (5-sq. kilometer) wildfire burning in timber in steep terrain about 40 miles east of McCall.

Authorities say the wildfire on Friday is expected to grow due to steep terrain, heavy fuels and danger to firefighters in an area with dead trees that might fall on them.

About 300 personnel are assigned to the lightning-caused blaze that started July 15.

The eastern edge of the fire is burning in the Frank Church River of No Return Wilderness and officials say the wildfire there will be allowed to play its natural role.

Officials say the estimated containment date for the wildfire is Oct. 1.