FORT CARSON, Colo. -- More than 50 firefighters are battling a 8,000-acre wildfire in the Red Rock Canyon area of Fort Carson's Pinon Canyon Maneuver Site.

Fort Carson officials said they believe lightning started the blaze at the training site in southeastern Colorado at about 1 p.m. Tuesday.

It is about 30 miles inside the entrance to the training site, on the north end. No structures are threatened.

Image: Map Of Fire Area

Fort Carson and U.S. Forest Service firefighters are at the scene, backed by two Blackhawk helicopters and a Forest Service air tanker. An Army CH-47 Chinook helicopter is transporting supplies and personnel from Fort Carson to the training site.

Air space over the area has been restricted.

The Pinon canyon site is controversial because the Army wants to nearly triple the size of the site, to more than 1,000 square miles, citing growth and changing training needs.

Commanders said they want to buy the land from willing sellers.

Neighbors said they do not want to sell and are concerned they will be forced to sell.