The fire was reported shortly before 6 p.m. in the area of Limonite Avenue and El Palomino Drive in Jurupa Valley, near Riverside.
No evacuations have been ordered at this time. No injuries have been reported.
Heavy smoke could be seen for miles as flames, fanned by 15-20 mph winds, burned in a neighborhood densely populated with trees and vegetation.
A water-dropping helicopter helped with the aerial attack of the fire as ground crews worked to protect nearby structures.
The cause of the fire is under investigation.
This is a developing news story. Updated information will be posted here as it becomes available.
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