LOS ANGELES — A wildfire raged out of control along the northern edge of Los Angeles early Friday, forcing thousands of people from their homes as firefighters battled flames from the air and on the ground.

Police Chief Michel Moore said mandatory evacuations encompassed about 100,000 people in over 20,000 homes.

Fire Chief Ralph Terrazas said the fire had grown to more than 7 square miles (18 square kilometers) and at least 25 homes had been damaged. A middle-aged man who was near where the fire was burning went into cardiac arrest and died, the chief said, but he did not have details.

The blaze erupted around 9 p.m. Thursday along the northern tier of the San Fernando Valley as powerful Santa Ana winds swept through Southern California.

Terrazas said there were sustained winds of 20-25 mph (32-40 kph) with gusts over 50 mph (80 kph) and relative humidity levels had fallen as low as 3%.

“As you can imagine the embers from the wind have been traveling a significant distance which causes another fire to start,” Terrazas said.

The fire erupted in Sylmar, the northernmost portion of the valley, and spread westward at a rate of 800 acres (324 hectares) an hour into Porter Ranch, part of a so-called urban-wildland interface where subdivisions crowd against the foothills of the Santa Susana Mountains. The cause wasn’t immediately known.

Porter Ranch, an upper middle class suburb that was the backdrop for the 1982 movie “E.T.” is no stranger to evacuations. Four years ago, a blowout at an underground natural gas well operated by Southern California Gas Co. in the neighboring Aliso Canyon storage facility drove 8,000 families from their homes.

In Northern California, the lights were back on Friday for more than half of the 2 million residents who lost electricity after the Pacific Gas and Electric Co. utility switched it off on Wednesday to prevent its equipment from sparking wildfires during dry, windy weather.

PG&E restored the power after workers inspected power lines to make sure it was safe to do so. The winds had increased the possibility of transmission lines toppling to the ground and starting wildfires.

Helicopters made repeated water drops as crews in Los Angeles attacked flames in and around homes. Water- and retardant-dropping airplanes joined the battle after daybreak. About 1,000 firefighters were on the lines.

Edwin Bernard, 73, said he and his wife were forced to leave their four cats behind as they fled their Sylmar home.

Bernard, standing outside the evacuation center at the Sylmar Recreation Center on Friday, said they were only able to grab their three dogs. During a previous wildfire, they’d had time to find their passports and photo albums, but not Thursday night.

“The fireman said, ‘go, go, go!’” Bernard said. “It was a whole curtain of fire,” he said. “There was fire on all sides. We had to leave.”

Evacuations were also still in effect in the inland region east of Los Angeles where a fire erupted Thursday and raged through a mobile home park in the Calimesa area of Riverside County.

Seventy-four buildings were destroyed, others were damaged and Riverside County authorities were trying to determine if anyone was missing.

One person who couldn’t be immediately located was Don Turner’s 89-year-old mother.

Lois Arvickson called her son from her cellphone to say she was evacuating shortly after the blaze was reported in the small city of Calimesa, Turner said while with relatives at an evacuation center.

“She said she’s getting her purse and she’s getting out, and the line went dead,” he said.

Arvickson’s neighbors saw her in her garage as flames approached, according to Turner. A short time later the neighbors saw the garage on fire, but they don’t know if she’d managed to escape, he said.

Fire danger is high throughout Southern California after the typically dry summer and early fall, and the notorious Santa Ana winds — linked to the spread of many wildfires — bring a dangerous mix of witheringly low humidity levels and powerful gusts.

The Calimesa fire erupted when the driver of a commercial trash truck dumped a smoldering load to prevent the vehicle from catching fire.

Dry grass quickly ignited and winds gusting to 50 mph (80 kph) blew the fire into the Villa Calimesa Mobile Home Park about 75 miles (120 kilometers) east of downtown Los Angeles. The park has 110 home sites and was built in 1958, according to its website. Fire officials were investigating what caused the trash in the truck to catch fire in Calimesa.

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