A wildfire that has forced the evacuation of more than 2,000 homes in central Idaho roared largely unchecked into a 12th day on Monday near the ski resort of Sun Valley, even though fire crews launched a big offensive against the blaze at the weekend.

Firefighters took advantage of calmer winds and higher humidity levels on Sunday to attack the flames aggressively, but still ended the day with containment lines carved around less than 10 percent of the blaze's perimeter, fire officials said.

The lightning-sparked fire has been raging since Aug. 7 near Sun Valley and the adjacent tourist towns of Ketchum and Hailey. It has charred some 101,000 acres (41,000 hectares) of parched sagebrush, grasslands and pine forests in the Sawtooth National Forest.

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