Hundreds of firefighters were involved in the operation to control the fire in the Santa Ana mountains on Friday, building barriers and establishing containment lines.
The governor has declared a state of emergency and has freed up extra resources to tackle the flames.
High temperatures, strong winds and tinder-dry vegetation have accelerated the spread of the fire and officials admit it is only around ten percent contained.
Meanwhile, a man has appeared in court accused of arson. Authorities say Forrest Clark intentionally started the fire on Monday after a dispute with his neighbours going back ten years.
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