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JACKSON, Wyo. (AP) _ A fire that began in a recreation area burned quickly through 150 acres of dry, dense vegetation, forcing the evacuation of campers and threatening scores of homes nearby.

The fire was first reported Sunday at a half-acre, about six miles southwest of Jackson. An unknown number of campers were evacuated, and the fire spread toward several subdivisions containing about 170 homes.

Residents ``have been notified to prepare for an evacuation call,'' said Jay Anderson, spokesman for the Bridger-Teton National Forest.

The resort town of Jackson was not threatened; all roads and businesses remained open.

Firefighters were aided by three helicopters and two tanker planes making water drops. The fire's cause was not immediately known.

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