The blaze, dubbed the "Mount R" fire, broke out in the San Bernardino National Forest and was at 58 acres and 38% containment as of Saturday night, according to the San Bernardino National Forest Twitter page. Evacuation orders have since been lifted.
Investigators say a "person or persons of interest" were seen in a black Audi sedan with a broken tailight leaving the fire's point of origin on Friday.
The cause of the fire remains under investigation. No injuries and no immediate threats to structures were reported.
Anyone with information is asked to contact forest officials at (909) 383-5651.