BOISE -- Authorities say a wildfire threatening nearly a dozen structures in southwestern Idaho appears to have been caused by a utility vehicle that caught fire along a roadway.

The Boise National Forest said Tuesday the Trinity Ridge Fire has spread to 3,300 acres and could potentially grow very large because of dry conditions and the terrain. The fire started last Friday and is burning in heavy timber about 50 miles east of Boise.

Fire officials were expected to brief local residents at noon in the town of Pine.

A community meeting was also scheduled in the central Idaho town of Stanley, which is less than 20 miles from the state's largest wildfire. The Halstead Fire in the Frank Church River of No Return Wilderness has burned more than 50 square miles.

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