Photos showed structures ablaze in Simi Valley, California.

A fast-moving wildfire near Simi Valley continues to spread under gusty winds as firefighters race to increase containment.

A fast-moving wildfire in Simi Valley has triggered evacuation orders for multiple zones, threatening homes.

As dangerously hot air bakes parts of the Southwest, forecasters are flagging elevated odds of significant wildland fire activity.

California fire coordinators are offering the public a unique look at the aerial battle against the Sandy Fire in Simi Valley, which burned at least two structures and forced widespread evacuations on Monday.

Firefighters are racing to keep flames away from the Santa Susana Field Laboratory, a former nuclear and rocket testing site.

A fast-moving brush fire broke out Tuesday morning along the Santa Ana River in Riverside County.