In Riverside County, a fire that erupted near a park Sunday afternoon threatened as many as 200 homes as it quickly spread to more than 150 acres of brush.

More than 150 firefighters, aided by five water and retardant dropping aircraft, worked in 90-degree heat to contain 35 percent of the blaze.

Further south, a fire that started near the Campo Indian Reservation destroyed four homes and threatened 80 more in a rural part of San Diego County. More than 300 firefighters are battling that blaze.

The causes of both fires are under investigation.