FLAGSTAFF — The Coconino National Forest is responding to the 20-plus-acre Slate Fire located in the northern part of the Flagstaff Ranger District near Highway 180 and the border of the Kaibab National Forest.

Roughly 50 personnel — including four engines, two crews, a water tender and a dozer — have been dispatched to the fire.

Traffic along Highway 180 may be affected.

The fire was called in at about 4 a.m. and the cause is still under investigation.