Cooler weather helps firefighters in battle against 3 major Southern California fires

No deaths have been reported, but at least a dozen people, mainly firefighters, have been treated for injuries, mostly heat-related, authorities said.

In the small community of Wrightwood, about 90 minutes outside Los Angeles, authorities implored residents to flee as the Bridge Fire exploded in size late Tuesday. The blaze has burned more than a dozen homes in the area.

UCLA climate scientist Daniel Swain said the fire moved extraordinarily fast across complex terrain, likely giving residents less time to evacuate than usual and surprising even seasoned fire officials.

The Bridge Fire "had to go up mountainsides, burn downslope, jump across valleys, burn across new ridges, and then make it downslope again at least two other times in effectively one burning period," he said Wednesday.

The blazes are burning through dense vegetation that grew after two back-to-back wet winters that included snow storms that caused tree branches to break, leaving behind a lot of "dead and down fuel," said Cal Fire Operations Section Chief Jed Gaines.

The full extent of the damage caused by the fires remained unclear. The three blazes are:

— The Airport Fire in Orange County, which has burned more than 36 square miles (93 square kilometers). The fire was 5% contained Thursday morning and was reportedly sparked by workers using heavy equipment in the area. Orange County Fire Capt. Steve Concialdi said eight firefighters have been treated for injuries, mostly heat-related. One resident suffered smoke inhalation and another burns, he said. Several homes burned in El Cariso Village.

— The Line Fire in the San Bernardino National Forest, which was 18% contained Thursday and had charred 58 square miles (150 square km). The blaze has injured three firefighters. Authorities said it was caused by arson in Highland. A suspect was arrested Tuesday.

— The Bridge Fire east of Los Angeles, which grew tenfold in a day and has burned 80 square miles (207 square km), torched at least 33 homes and six cabins and forced the evacuation of 10,000 people. The cause of the fire is not yet known. It remained zero percent contained Wednesday night.

Gov. Gavin Newsom sent National Guard troops in to help with evacuations, and the White House said President Joe Biden was monitoring the situation.

In El Cariso Village, a community of 250 people along Highway 74 in Riverside County, an Associated Press photographer saw at least 10 homes and several cars engulfed in flames.

Orange County Fire Authority Incident Commander Kevin Fetterman said the blaze has been difficult to tame because of the steep terrain and dry conditions — and because some areas hadn't burned in decades.

More than 5,500 homes in Riverside County were under evacuation orders, affecting more than 19,000 residents. Several recreational cabins and structures in the Cleveland National Forest have been damaged.

In San Bernardino County, some 65,600 homes and buildings were threatened by the Line Fire, and residents along the southern edge of Big Bear Lake were told to leave Tuesday.

The Line Fire blanketed the area with a thick cloud of dark smoke, which provided shade for firefighters trying to get ahead of winds expected Wednesday, said Fabian Herrera, a spokesperson for those battling the Line Fire.

A man from the town of Norco suspected of starting the Line Fire on Sept. 5 was arrested and charged with arson, San Bernardino County Sheriff's Department said. Officials did not specify what was used to start the fire.

Investigators collected evidence from the man's vehicle and home that suggests he could have been involved in starting other fires, San Bernardino County Sheriff Shannon Dicus said Wednesday.

On the Nevada border with California near Reno, the Davis Fire forced thousands of people to evacuate over the weekend, destroyed one home and a dozen structures and charred nearly 9 square miles (23 square km) of timber and brush along the Sierra Nevada's eastern front.

Rich Meyr and Evelyn Kelley were the first arrivals at an evacuation center set up Wednesday at a recreation center in south Reno. Both said they refused to evacuate previous fires but decided to play it safe this time.

"My son's wedding is Saturday. I threw all the flowers and gowns in the RV and we left. It looks like a garden shop inside that RV," Kelley said. "But who wants to burn alive?"

More than 600 firefighters kept the blaze from growing Wednesday despite high winds that grounded all aircraft that had dropped retardant on the flames over the past two days. The fire was about 30% contained Wednesday night.