Apple fire continues to spread in Riverside and San Bernardino counties

The Apple fire continues to burn thousands of acres north of Cabazon.  (Robert Gauthier / Los Angeles Times)

The Apple fire continues to burn thousands of acres with little containment. A helicopter hits a hot spot north of Banning.  (Robert Gauthier / Los Angeles Times)

A sign of gratitude along Oak Glen Road, not far from the presumptive source of the Apple fire, where investigators say they believe a spark from a diesel engine ignited dry brush.  (Robert Gauthier / Los Angeles Times)

A shell of a burned car sits along Avenida Miravilla days after the Apple fire rushed through on its way to the nearby San Bernardino National Forest.  (Robert Gauthier / Los Angeles Times)

Firefighters set back fires as the leading edge of the Apple fire rages towards the Oak Canyon Conservation Camp near Beaumont on Saturday.  (Luis Sinco / Los Angeles Times)

A slow camera exposure shows the movement of the Apple fire as it continues to burn into the night in the San Bernardino National Forest just above Bluff Street in Cherry Valley.   (Gina Ferazzi/Los Angeles Times)

A sign with Smokey Bear is enveloped in smoke from the Apple fire at the Oak Canyon Conservation Camp near Beaumont.  (Luis Sinco / Los Angeles Times)

A firefighter sets back fires as the leading edge of the Apple fire rages towards the Oak Canyon Conservation Camp near Beaumont.  (Luis Sinco / Los Angeles Times)

A plane drops fire retardant over a home as the out-of-control Apple fire burns around it in Cherry Valley, Calif.  (Gina Ferazzi / Los Angeles Times)

San Gorgonio Mtns, Sunday, August 2, 2020 - Smoldering brush remains after fire swept through the Whitewater Preserve Trail. (Robert Gauthier / Los Angeles Times)  (Robert Gauthier/Los Angeles Times)

San Gorgonio Mtns, Sunday, August 2, 2020 - Riverside/CAL firefighter Anthony Vierra cools hot spots after fire swept through the Whitewater Preserve Trail, East of the Apple Fire. (Robert Gauthier / Los Angeles Times)  (Robert Gauthier/Los Angeles Times)

The Apple fire burns in the San Bernardino Mountains above Beaumont on Saturday.  (Luis Sinco / Los Angeles Times)

The Apple fire consumes a tree at the Oak Canyon Conservation Camp near Beaumont.  (Luis Sinco / Los Angeles Times)

A firefighter from Carpinteria monitors a huge plume of smoke from the Apple fire along Bluff Street, north of Banning.  (Gina Ferazzi / Los Angeles Times)

A firefighter battles the Apple fire at the Oak Canyon Conservation Camp near Beaumont.  (Luis Sinco / Los Angeles Times)

A statue of Smokey Bear is enveloped in smoke from the Apple fire at the Oak Canyon Conservation Camp near Beaumont.  (Luis Sinco / Los Angeles Times)

Wildland firefighters work a line to douse hot spots along Avenida Miravilla in Cherry Valley, Calif.  (Gina Ferazzi/Los Angeles Times)

San Gorgonio Mtns, Sunday, August 2, 2020 - The Apple Fire continues to burn thousands of acres North of Banning. (Robert Gauthier / Los Angeles Times)  (Robert Gauthier/Los Angeles Times)