LARAMIE, Wyo. (AP) — Aircraft have been requested to help contain a wildfire burning in the Medicine Bow National Forest west of Laramie.

Fire managers said Tuesday they ordered two heavy air tankers and three helicopters. Forty firefighters were on the scene.

The blaze had burned about one-half square mile. No figures were available on progress toward containing it.

The Lake Owen Campground was evacuated Monday and residents along Fox Creek Road were advised to be prepared to leave.

The fire began at noon on Monday. The cause hasn't been released.

No injuries or damaged structures have been reported.

A small, lightning-caused fire is being allowed to burn in Grand Teton National Park. The Jackson Hole News & Guide reports the fire is in a remote area west of Jackson Lake.