The blaze, called the Diamond Fire, broke out at about 1 a.m. and was burning at a slow rate of spread near the area of Warren and Old Mine roads, according to Cal Fire Riverside.
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Shortly before 3:30 a.m., fire officials said the forward spread of the fire had been stopped. By 8 a.m., they described the blaze as 75% contained.
There were no evacuation orders and no injuries have been reported.
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It was not known how the fire started.