Firefighters are working to extinguish a fast moving brush fire that erupted north of state Route 76, prompting evacuation orders according to Cal Fire .
Flames were reported at 5:45 p.m. burning in grass and brush with a moderate rate of spread east of the Pala Casino Spa Resort, off Henderson Road.
By 6:45 p.m. the burn area had increased to between 30 and 40 acres, with flames moving to the northwest, but officials soon said the total had jumped to nearly 145 acres.
According to the nonprofit fire monitoring service Watch Duty, helicopters and fixed-wing tankers have responded to the scene, along with ground crews.
Structures are threatened, officials said. Zones being evacuated are directly north and east of the fire, and include Chief Mountain and areas approaching Heriot Mountain