PHOENIX -- Crews are responding to a wildfire that is burning northwest of Flagstaff, Ariz., the U.S. Forest Service said in an email.
The Wild Bill Fire has burned between 15 and 20 acres, but "crews are already making good progress."
Smoke is visible from Flagstaff, Bellemont, Ariz., and Interstate 40. Some aircraft may also be visible.
The fire was 50 percent contained on Friday evening.
The fire was first reported about 9:30 a.m. Friday. It is unknown what started the fire.
The Associated Press contributed to this story.