The Clay Fire was one of several fires that broke out in Southern California Tuesday as parts of the region sees red flag warnings through Thursday.

Clay Fire initially started today at 5 p.m. in Riverside County. After being active for six hours, it has burned 38.5 acres. As of Tuesday evening, 40% of the fire was brought under containment by a crew of 165 firefighters. The cause of it remains under investigation.

Firefighters in Riverside County battled a wildfire that erupted in the Santa Ana river bottom Tuesday night, prompting evacuation warnings for residents in nearby homes. Sandra Mitchell reports Jan.

Jurupa Valley fire crews battled a brush fire in the Santa Ana River bottom, after having extinguished a blaze in a similar location last week.

SkyFOX was over the scene of the "Clay Fire" in Riverside County. Officials did not say what caused the fire to start. The cause of the fire remains under investigation. Evacuatio