Firefighters are unable to approach the fire from the ground due to rugged cliffs in the area.

Firefighters are working to extinguish the five acre Popcorn Fire in the Castle Crags Wilderness.

US Forest Service firefighters from the Shasta-Trinity National Forest responded to the fire Saturday afternoon around 3 p.m., according to a press release.

The fire was originally estimated be 10 acres in size, but was reduced by half with better visibility, the release states.

The fire was assessed from the air by helicopter yesterday for suppression opportunities, the Forest Service reported..

Firefighters are unable to approach the fire from the ground due to rugged cliffs in the area.

The fire is burning in downed woody material and brush in a bowl. It is surrounded on all sides by large granite faces and spires, making it only accessible on the ground with ropes and climbing equipment.