MENDOCINO NATIONAL FOREST, Calif. – Work is continuing on a wildland fire burning since Friday on the Mendocino National Forest.

Fire crews have reached 75 percent containment on the 127-acre Open fire on the Grindstone District of the Mendocino National Forest, according to forest spokeswoman Punky Moore.

The fire, first reported at 2 p.m. Friday, is located 25 miles west of Willows on Open Ridge in grass, oak and mixed timber, Moore said.

Moore said approximately 100 resources remain assigned to the incident including crews, engines and water tenders. The fire is smoldering with some isolated hot spots.

The forecast called for gusty winds up to 20 miles per hour Sunday night.

Crews will be staying on the fireline to ensure burning embers do not spread outside the established lines. Moore said there are no structures immediately threatened.

The cause of the fire remains under investigation, Moore said.