YUKON, Okla. (KFOR) — Fire crews worked to put out a grass fire on Tuesday afternoon that was sparked by a tractor near Wilshire Boulevard and Mustang Road. Grass fire near Wilshire Boulevard and Mustang Road. Photo courtesy KFOR. Video from McIntyre Law Chopper 4 shows two sections of a field that appear to have burned while the tractor was being used to mow the grass. While the majority of the fire has been put out, drivers are advised to avoid Wilshire Blvd between Sara Road and Mustang Road due to fire trucks in the roadway.