FRESNO, Calif. (KMPH) -
Fire crews are battling a fire in the Sierra National Forest.
Firefighters say the "Sugar Pine Fire" is contained to about 20 acres, but it's not yet out.
The fire broke out early Tuesday morning in the area near Mill Canyon Road and Highway 41 -- that's near the Sugar Pine Railroad.
No one has been hurt, and no structures have burned.
Investigators are still trying to figure out what started the fire.
Stay with KMPH News and KMPH.com as we continue to follow this story.