Los Angeles, California - Firefighters on Wednesday battled a ferocious wildfire in Los Angeles suburbs, with whole buildings devoured and thousands of people evacuating in a panic.

Frightened residents abandoned their cars on one of the few roads in and out of the upscale Pacific Palisades area, fleeing on foot from the 3,000-acre blaze engulfing an area packed with multimillion-dollar homes in the Santa Monica Mountains.

Firefighters used bulldozers to push dozens of expensive vehicles to one side, leaving many crumpled and with their alarms blaring. Some celebrities posted comments and pictures on social media platforms.

More than 1,400 firefighters were on the ground, with hundreds more on the way, California Governor Gavin Newsom said.

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One firefighter was reportedly among several injured in the Palisades.

"Extreme fire behavior... continues to challenge firefighting efforts for the Palisades Fire," with winds gusts up to 60 miles per hour expected to continue through Thursday, said the LA fire department in its latest update.

Around 30,000 people were ordered to evacuate the fast-spreading flames, which leveled multiple homes as powerful winds spread embers far and wide.

The fire erupted midmorning and swelled quickly, taking many residents by surprise.

One man, who gave his name as Gary, told broadcaster KTLA that hot ashes were raining down on his community of Sea Ridge.

"There was smoke in the distance, and I was assured that it would not come over the hill... Five minutes later, it's coming down the hill," he said. "Everyone panicked, that's when everybody made a run and went to go and pack their houses up."

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Evacuee Kelsey Trainor said she saw the fire explode in size as she was fleeing.

"By the time we got to the bottom of the hill, which is about two or three miles, there were flames on both sides of the road, and it became gridlocked," she said. "No one knew what to do. Everyone was honking their horns. There's flames all around you.

"I could see people walking with suitcases, with their dogs, children. An elderly woman was really visibly upset and in tears."

Pacific Palisades resident Andrew Hires told AFP he got a text alerting him to the fire as his child was at the dentist about to have a tooth extracted.

"We pulled off the mask and ran to the car," he said.

Velma Wright, who is 102, was evacuated from a care facility as embers and flames approached in Pasadena, an AFP photographer saw, from where dozens of other residents were moved.

Trees and vegetation around the prestigious Getty Villa Museum were burned, but the structure and collections were spared, the museum said in a post on X.

The Getty, set up by US oil billionaire and collector J. Paul Getty and one of the world's richest art museums, houses Greek and Roman antiquities in a replica Roman country home.

Actor James Woods – ironically a climate change denier – posted a video on X showing flames engulfing trees and bushes near his home as he got ready to evacuate, and shortly afterward said all the fire alarms were going off.

"I couldn't believe our lovely little home in the hills held on this long. It feels like losing a loved one," Woods said.

Across town, on the northern edge of Los Angeles, another fire broke out in Eaton Canyon, near Pasadena, quickly consuming 200 acres Tuesday night, according to Angeles National Forest officials.

The city of Malibu, which just last month experienced the devastating Franklin Fire, told its residents via social media post to "prepare to evacuate quickly if fire conditions worsen. Evacuate now, especially if you need extra time or have pets/livestock."

President Joe Biden – who was in Los Angeles for a planned announcement on new national monuments – said he was "being frequently briefed on the wildfires" and has offered "any federal assistance that is needed."

Vice President Kamala Harris, who has a house in California, said she was praying for "fellow Californians who have evacuated."

The fire came as the area was being hit by seasonal Santa Ana winds that forecasters said could develop into the worst windstorm in a decade, with gusts of up to 100 miles an hour expected.

"This looks pretty, pretty concerning," said meteorologist Daniel Swain.

"And what's going on now is only just the beginning, because weather conditions are going to get a lot worse."

With a huge pall of smoke visible over the whole of Los Angeles, events throughout the area were cancelled, including a red-carpet premiere of Jennifer Lopez's new film Unstoppable.

Though wildfires are an expected part of life in the US West and play a vital role in nature, human-caused climate change is altering weather patterns.

Southern California had two decades of drought that were followed by two exceptionally wet years, which sparked furious vegetative growth – leaving the region packed with fuel and primed to burn.