More than one hundred firefighters from Ventura County and Santa Barbara County are battling a 20-acre wildfire in Holser Canyon near Piru. Firefighters tell KEY News the flames are being fanned by ten mile an hour winds. Air support has been brought in to make drops on the fire. Crews say they have the fire 25% contained and are hoping for full containment by later tonight. No structures are threatened and the cause of the fire is still unknown. KEY News will continue to bring you updates on the status of the fire fight as information becomes available.