Wildfire operations were halted at the Foot Creek Fire in Wyoming as planes entered the area.

"We were grounded a little over an hour for each instance,” Sara Evans Kirol, Bighorn National Forest public affairs specialist told The Cowboy State Daily.

The U.S. Forest Service is using drones to map and photograph the fire that continues to grow. One incident occurred on Saturday, the other on Sunday.

Wildfire crews were unable to get the tail numbers on the low-flying planes that made multiple passes.

“It could cause a fatal crash and not only impact the pilot and whoever their passengers are but also impact people on the ground or homes on the ground. It’s a very serious issue.”

The FAA had placed a temporary flight restriction in the area as firefighters continued working to control the blaze.

U.S. Forest Service officials reminds pilots: "If you fly, we can't."

Robert Gill, airport manager of the Sheridan County Airport, told a reporter that the Foot Creek area is normally unrestricted airspace, and it's possible a pilot missed the notice.

“There’s a lot of smaller aircraft in the area. I like to think the best and that somebody probably wasn’t aware that the TFR was out.”