A fire that sparked Friday on national forest land in central Arizona has burned 60 acres.
The Payson Ranger District of the Tonto National Forest says the Knoll wildfire was spotted on Friday about 13 miles northeast of Payson.
As of Saturday morning, officials estimate the fire to be 40 percent contained. The fire is burning in brush, juniper and ponderosa pine near Robert's Mesa, one mile north of Meads Ranch.
More than 140 firefighters are working to contain the fire. Based on a preliminary investigation, officials say the wildfire was caused by fireworks.
It’s unclear if the person or people responsible will be charged. The use of fireworks is against the law on national forest land in Arizona and New Mexico.