NEW : Stacked logs at a saw mill were also engulfed by the fire . The fire is on the Yakama Indian Reservation . Firefighters have not official determined what sparked the blaze , but are considering it to be accidental , Spencer said . A helicopter drops water to fight the blaze in an area of Okanogan County that has been hit hard by wildfires.
NEW : Stacked logs at a saw mill were also engulfed by the fire . The fire is on the Yakama Indian Reservation . A helicopter drops water to fight the blaze in an area of Okanogan County that has been hit hard by wildfires.