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MONTECITO, California (CNN) -- One of three major wildfires burning in southern California appears to be "human caused," a spokesman for the state's fire agency said Sunday.

Investigators have eliminated "all accidental causes" of the fire that has destroyed 210 homes and injured two in Santa Barbara County since Thursday, and arson is suspected, spokesman Doug Lannon said.

"We need the public's help in identifying any activity in or around the afternoon of November 13," Lannon said.

The fire has burned 1,940 acres, including a monastery and several mansions in the Montecito community, where celebrities, including Oprah Winfrey, have homes. It was 75 percent contained Sunday, Lannon said. Watch expensive homes go up in flames »

Authorities believe the fire started in the Tea Garden Estate, a privately owned multi-acre property, about one mile north of Santa Barbara's exclusive Westmont College. On Friday, arson investigators cordoned off the estate after several eyewitnesses told authorities they believed the fire originated in that area, according to Lannon.

The other major fires burning Sunday were in the northern Los Angeles area and in Orange County, east of Los Angeles. The three blazes have scorched 20,000 acres and have forced more than 10,000 people to flee their homes, authorities said.

Authorities on Sunday were searching through the wreckage of nearly 500 mobile homes destroyed Saturday in the northern Los Angeles area blaze, known as the Sayre Fire.

As of early Sunday afternoon, a third of the mobile homes had been searched, and "no human remains have been found," according to Los Angeles Deputy Police Chief Michael Moore.

Police had not received any reports of missing persons from the park. Moore said 134 residents had been accounted for, and that the others should check in with city authorities.

Los Angeles County Coroner Ed Winter said authorities believe "most of the people from this mobile home park were evacuated," and that the search was precautionary.

The Sayre Fire erupted late Friday in the steep terrain of the Angeles National Forest on the outskirts of the Sylmar neighborhood, about 20 miles north of downtown Los Angeles. See images from the Los Angeles County fire »

The Sayre Fire has burned about 9,500 acres in the San Fernando Valley and was about 30 percent contained, California fire officials said Sunday.

Nine other homes and 10 businesses had been destroyed in Los Angeles by Saturday evening, Mayor Antonio Villaraigosa said.

Firefighters were struggling to contain the third blaze, in Orange County, said Lynette Round, a spokeswoman for Orange County Fire Authority. iReport.com: 'Insurmountable' wall of flames looms

Firefighters were hoping that strong winds in southern California would die down Sunday, helping them to quell the blazes.

"If the winds die down it will give the firefighters an upper hand on fighting this," Round told CNN on Sunday morning. "It is a wind-driven fire and with those gusty winds up to 25 miles an hour, it's giving the firefighters a really difficult time. It's hopscotched throughout the county."

Round said 168 homes were destroyed or damaged in the Orange County area. The so-called Triangle Freeway Complex Fire had also damaged a building at a high school, Round said.

That blaze, which has burnt 10,475 acres, is not contained at all, and is spreading throughout Orange County, posing threats to Yorba Linda, Corona, Brea, Chino Hills and Anaheim Hills neighborhoods, according to California fire officials. Watch residents as fire approaches their homes »

Winds -- which have joined with low humidity and unseasonably high temperatures to help strengthen the fires -- were gusting up to 80 mph Saturday. The high temperature in Los Angeles reached 92 degrees, according to the National Weather Service.

Gov. Arnold Schwarzenegger declared states of emergency for the affected counties after the fire damaged or destroyed hundreds of homes and closed major freeways.

The move frees up any state resources needed for fire-fighting, and makes the counties eligible for federal assistance grants.

In Los Angeles, Villaraigosa declared a city emergency early Saturday morning and called for the public's cooperation in conserving energy as potential blackouts loomed. iReport.com: Share wildfire photos, video

Augustine Reyes and his family left their home in Sylmar about 2 a.m. Saturday when they could no longer stand the oppressive heat and smoke encroaching from the hills behind their home.

When Reyes returned to survey the scene Saturday afternoon, all that remained were heaps of charred rubble.

Reyes dabbed his eyes with a bandana as he worried over how to describe the loss to his 7-year-old son.

"He's autistic and doesn't do well with change, so this is going to be very hard to explain to him," Reyes said. Watch residents reflect after their homes are burned to the ground »

By Saturday afternoon, people were taking refuge in evacuation shelters set up in three high schools in the area, officials said.

Horses and other large animals were taken to a makeshift shelter in Hansen Dam Park. A mobile kennel was set up at Sylmar High School, and small pets can be taken to the Mission animal shelter.

As for the Santa Barbara County fire, Lannon urged anyone who may have spotted suspicious vehicles or people in the area of the Tea Garden Estate in Montecito to call fire investigators at 951-969-2537, 951-314-0420 or 661-330-0129.

Southern Californians endured a third day of devastation Saturday as wind-blasted wildfires torched hundreds of mobile homes and mansions, forced thousands of people to flee and shut down major freeways.

No deaths were reported, but the Los Angeles police chief said he feared authorities might find bodies among the 500 burned dwellings in a devastated mobile home park that housed many senior citizens.

"We have almost total devastation here in the mobile park," Fire Capt. Steve Ruda said. "I can't even read the street names because the street signs are melting."

The series of fires has injured at least 20 people and destroyed hundreds of homes from coastal Santa Barbara to inland Riverside County, on the other side of the Los Angeles area. Smoke blanketed the nation's second-largest city and its suburbs Saturday, reducing the afternoon sun to a pale orange disk.

As night fell, a fire hopscotched through the winding lanes of modern subdivisions in Orange and Riverside counties, destroying more than 50 homes, some of them apparently mansions.

A blaze in the Sylmar community in the hillsides above Los Angeles' San Fernando Valley destroyed the mobile homes, nine single-family homes and several other buildings before growing to more than 8,000 acres - more than 12 square miles. It was only 20 percent contained Saturday.

It sent residents fleeing in the dark Saturday morning as notorious Santa Ana winds topping 75 mph torched cars, bone-dry brush and much of Oakridge Mobile Home Park. The blaze, whose cause was under investigation, threatened at least 1,000 structures, city Fire Department spokeswoman Melissa Kelley said.