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ORANGE COUNTY, California (CNN) -- One of the larger fires in Southern California is a suspected arson, a fire official confirmed Thursday.

The FBI, the Bureau of Alcohol, Tobacco, Firearms and Explosives and the Orange County Fire Authority are investigating the Santiago Fire, which has burned more than 22,000 acres, Orange County Fire Battalion Chief Kris Concepcion told CNN.

"The reason we think it is [arson] is because we found multiple points of origin," Concepcion said. "... Our investigators have confirmed that this is, in fact, arson."

Concepcion would not say how the fire was started, but said evidence indicated the arsonist wanted the fire to grow rapidly.

All three of its points of origin are considered crime scenes, said Jim Amornino, a spokesman for the Orange County Sheriff's Department.

A $70,000 reward is being offered for any information leading to the arrest of those responsible for setting the fire. No suspects have been identified.

The state established a toll-free arson tip line at 800-540-7085. Gov. Arnold Schwarzenegger said anyone convicted of arson would be dealt with harshly.

Concepcion said about 1,100 firefighters were working on controlling the blaze, which has destroyed at least 22 structures. The California Department of Forestry and Fire Protection said the fire was only 30 percent contained Thursday morning after being 50 percent contained the day before.

Concepcion said onshore winds Thursday morning should help firefighters "get the upper hand on this thing."

The arsonist's motive was a mystery to Concepcion.

"That's the part that I really can't figure out, to tell you the truth," he told CNN. "That individual knew on Sunday when this fire started that we had, really, the perfect storm, if you will. We had the heavy Santa Ana winds, we had the low relative humidities, we had the high temperatures.

"And then for someone to even think about doing something as reprehensible as starting a fire where they knew the fire would grow as rapidly as it would -- traveling about three, 3 ½ miles in about an hour -- is just really absolutely unconscionable," he said.

The smaller Rosa fire in Riverside County, 100 percent contained at 411 acres Thursday morning, was also probably arson, state officials said.

In San Bernardino County, a 48-year-old Hesperia man was arrested Tuesday evening and charged with setting a small fire along a rural roadside near Victorville.

Passers-by reported seeing a man crouching near the fire, the county sheriff's office spokeswoman Jodi Miller said. The man fled on a motorcycle and the witnesses put out the fire with shovels and dirt, Miller said.

A police helicopter spotted a motorcycle with a rider matching the witnesses' description, and John Alfred Rund was arrested at a residence. Investigators have not connected Rund with any other fires, Miller said.

"This guy's getting way more attention than he's worthy," she said.

Rund was to be arraigned Thursday morning in Victorville. He was being held in lieu of $750,000 bail.

ORANGE, California (CNN) -- With the number of uncontained fires down to nine in Southern California, Gov. Arnold Schwarzenegger turned his attention Saturday to what he called "the ugly side of human behavior" during and after the disaster.

At least two of the fires were started intentionally and two more have suspicious origins, he said during a news conference, issuing a warning for the arsonists.

"We will hunt down the people that are responsible for that," he said.

"If I were one of the people who started the fires, I would not sleep soundly right now, because we're right behind you," Schwarzenegger said, urging the culprits to turn themselves in.

Authorities said Saturday they were following 1,700 tips about a white Ford F-150 pickup that may be a lead in determining who set the sprawling Santiago Fire in Orange County.

Witnesses reported seeing the 1998-2004 model truck with chrome tubular running boards on Santiago Canyon Road on Sunday afternoon, about the time the Santiago Fire started.

Investigators said this week that the fire had two points of origin, and they found evidence at the scene, although they declined to describe it.

Possible leads have been coming in to a hotline.

The fire is 35 percent contained -- down from 50 percent on Wednesday.

It has burned 27,000 acres and destroyed 14 homes. There is a $250,000 reward for information leading to an arrest.

Authorities also consider the Rosa Fire in San Diego County, which burned more than 400 acres before being fully contained, an arson.

Five people in three counties have been arrested in arson probes, but none has been linked to any of the large fires.

Anyone who tries to rip off vulnerable homeowners and anyone else victimized by the fire will get "no mercy" in finding and prosecuting them, several officials said.

State Insurance Commissioner Stephen Poizner said his office has 100 fraud investigators on the ground going door-to-door with local law enforcement, telling residents how to avoid scam artists.

Detectives will also conduct sting operations to catch anyone trying to exploit those who have suffered.

At least two arrests were made in the past few days for looting, Poizner said. It turned out that both suspects were wanted for attempted murder, he said.

Meanwhile, downed power lines, leaking gas lines, broken water pipes and still-blazing fires have blocked the return of thousands of Southern Californians who fled their homes this week ahead of more than 20 wind-whipped wildfires.

Fourteen people died, seven from the fires and seven from causes linked to their evacuations.

With the number of uncontained fires down to nine, hundreds of thousands made the trip back home. For most, the return was, if not joyful, at least filled with relief.

Meanwhile, Schwarzenegger announced more help for victims of the fire.

Cash grants of up to $10,000 will be available to help people with expenses caused by the disaster, such as housing, medical costs and transportation, he said.

That's in addition to assistance provided by the Federal Emergency Management Agency.

"California stands ready to provide fire victims all the assistance they need to get their lives back on track. Even after the fires are extinguished, we will still be here to help fire victims in need," Schwarzenegger said.

In Poway, northeast of San Diego, Mike Perry and his neighbors watched in disbelief this week as fire climbed over a hill near his home and crept closer to his front door. He recalled the Cedar fire of 2003, which destroyed about 280,000 acres.

"It was a helpless feeling then," he said, gesturing toward a huge, high-powered industrial hose on his lawn that he bought at the time. As he talked to CNN, he clutched a massive wrench that he had used to turn it on.

With firefighters stretched thin, he used the hose this week to douse flames from the Rice Canyon Fire.

His neighbors, some of whom had bought their own sophisticated hoses, pitched in. Perry is sure that without them, his house would have been burned.

"It was surreal in that we were clearly thinking, we knew what we had to do," he said. "You had to save your home and your neighbors' homes, and that's what mattered."

The Rice Canyon Fire, which burned dozens of homes to the ground in Fallbrook, was 80 percent contained Saturday at about 9,000 acres as calmer winds made firefighters' jobs a little easier, fire officials said.

After a week in which nearly a million Southern Californians fled their homes in seven counties, fewer than 50,000 people remain under mandatory evacuation orders in hardest-hit San Diego County.

There, nine wildfires torched over 450 square miles, more than a tenth of the Connecticut-sized county's total area.

San Diego city officials closed Qualcomm Stadium, home to the NFL's Chargers, to evacuees at midday Friday and cleared the team to play its scheduled Sunday afternoon game there against the Houston Texans.

Air in San Diego County remains unhealthy, especially in Oceanside and Chula Vista, said Bill Brick, senior meteorologist for the Air Pollution Control District.

Public health experts recommend lightly misting indoor and outdoor hard surfaces before gently sweeping ash.

The number of people hurt in the fires increased Friday to 85, including at least 61 firefighters, according to the California Department of Forestry and Fire Protection. Flames destroyed at least 1,641 homes, the department said.

The cost of homes destroyed by the wildfires is likely to top $1 billion in San Diego County alone, an emergency official said.

Although forecasters predict no rain during the upcoming days, CNN's Jenny Harrison described a "much better picture" approaching -- including lighter winds and cloud coverage that will reduce temperatures and humidity.

"If I were one of the people who started the fires, I would not sleep soundly right now, because we're right behind you," Schwarzenegger said, urging the culprits to turn themselves in.