Clay Fire initially started 5 p.m. Jan. 21 in Riverside County. After being active for 37 hours, it has burned 39 acres. As of Thursday morning, 70% of the fire was brought under containment by a crew of 50 firefighters. The cause of it remains under investigation.

As the relentless Santa Ana winds sweep through, a new fire threat emerged in Jurupa Valley, leaving residents on edge and firefighters racing against time.

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. The Clay Fire, first reported at 5 p.