San Bernardino County sheriff’s deputies conduct door-to-door search in Big Bear, Calif, Thursday, Feb. 7, 2013.  Thousands of police officers hunted
San Bernardino County sheriff's deputies conduct door-to-door search in Big Bear, Calif, Thursday, Feb. 7, 2013. Thousands of police officers hunted Thursday for one of their own: a former Los Angeles officer angry over his firing and sought in a deadly shooting rampage after warning he would wage "warfare" on those who wronged him, authorities said. (AP Photo/Jae C. Hong) (Jae C. Hong)

| PHOTOS: SEARCH IN BIG BEAR

BIG BEAR LAKE - The manhunt continues today in the snowy, windy San Bernardino Mountains for fired LAPD Officer Christopher Dorner, who is suspected of killing an Irvine couple and a Riverside police officer in a vendetta against his former department.

Law enforcement in several cities checked out reported sightings of people resembling 33-year-old Dorner, but all of the reports, so far, have been unfounded.

San Diego County sheriff's deputies were still at the Barona Indian Reservation early Friday morning after a caller reported seeing Dorner at a residence around 10:15 p.m. Thursday. The report appeared to be false.

"They're having difficulty verifying the legitimacy of the sighting," San Diego County Sheriff's Lt. Jason Rothlein said.

Ontario police received a call at 12:30 a.m. this morning from a guest at the Hyatt Place Ontario/Rancho Cucamonga on Mills Circle who claimed to have spotted Dorner.

"It turned out it was one of their employees that looked similar, but it wasn't him," said Ontario police Sgt. Mark Guski.

Sheriff's deputies in Rancho Cucamonga received three or four calls from people who thought they saw Dorner driving on the 210 Freeway between 6 and 7 p.m. Thursday, but none of those drivers were Dorner.

San Bernardino County Sheriff John McMahon is expected to provide updates on the search in Big Bear Lake at 9 a.m. at the entrance of Bear Mountain Ski Resort.

Sheriff's officials have said the search for Dorner in the mountains will continue as long as weather permits.

And weather may be a challenge today. Forecasters at the National Weather Service have issued a winter storm warning, saying as much as 10 inches of snow could fall at elevations higher than 6,000 feet. Light snow had already been reported shortly before 3 a.m. at Big Bear City Airport and temperatures were in the mid 20s.

Law enforcement officers inspect a burned out Nissan pickup truck believed to be owned by ex-LAPD officer Christopher Jordan Dorner at Bear Mountain in Big
Law enforcement officers inspect a burned out Nissan pickup truck believed to be owned by ex-LAPD officer Christopher Jordan Dorner at Bear Mountain in Big Bear Thursday February 7, 2013. Dorner is the suspect in the killing of a Riverside police officer this morning and the killing of a couple in Irvine on Sunday. (Will Lester/Staff Photographer)
A recorded message was sent out to parents of Bear Valley Unified School District students, announcing that due to uncertainty about the whereabouts of Dorner and the ongoing search, schools would be closed Friday. Rim of the World Unified School District also closed schools, but it was due to the weather.

Authorities wouldn't say if they believe Dorner was still in the area. Police in Riverside and Los Angeles said there were no reported sightings of Dorner overnight in their cities.

The search for Dorner shifted to Big Bear Lake after an officer found the ex-officer's burned Nissan Titan pickup.

Cindy Bachman, spokeswoman for the San Bernardino County Sheriff's Department, said up to 400 homes were searched.

Officials also went to a property belonging to Dorner's mother in Arrowbear but didn't find the fugitive.

Deputies kept an eye on traffic travelling up and down the mountain.

Dorner was named as a suspect in the Feb. 3 fatal shootings of Walnut High School Hall of Fame member Monica Quan, 28, and her fiance, 27-year-old Keith Lawrence in Irvine.

Quan's father, retired LAPD Capt. Randal Quan, represented Dorner in disciplinary hearings that resulted in his dismissal.

According to Riverside police, Dorner shot two officers stopped at a light on Thursday. One was killed while the other was injured.

Dorner was fired from the LAPD in 2008 for making false statements related to a 2007 complaint he filed against his training sergeant.

Law enforcement keep a wary eye out for  ex-LAPD officer Christopher Jordan Dorner near Bear Mountain in Big Bear Thursday February 7, 2013. Dorner is the
Law enforcement keep a wary eye out for ex-LAPD officer Christopher Jordan Dorner near Bear Mountain in Big Bear Thursday February 7, 2013. Dorner is the suspect in the killing of a Riverside police officer this morning and the killing of a couple in Irvine on Sunday. (Will Lester/Staff Photographer)
He claimed she kicked a suspect who is mentally ill in the shoulder area and the face during an arrest at a hotel in San Pedro.

The suspect's father testified his son said he was kicked. Several witnesses told police they didn't see the sergeant kick the suspect.

Dorner lost his appeal to overturn his firing.

In an online manifesto he penned, Dorner spelled out his grievances against the LAPD, said he will bring "unconventional and asymmetrical warfare" to LAPD officers plus threatened to go after certain officers and their families. He claimed he wants his name cleared publicly.

"I have nothing to lose. My personal casualty means nothing," Dorner wrote.

"An enemy who embraces death is a lose, lose situation for their enemy combatants.

California Highway Patrol officers set up check points at all 3 exits from the Big Bear area on highways 18, 38 and 330 to check all vehicles that could
California Highway Patrol officers set up check points at all 3 exits from the Big Bear area on highways 18, 38 and 330 to check all vehicles that could possibly hide Christopher Jordan Dorner. The suspect's burned out Nissan pick up truck was found near Bear Mountain in Big Bear on Thursday. Dorner is the suspect in the killing of a Riverside police officer Thursday morning and the killing of a couple in Irvine on Sunday. (Will Lester/Staff Photographer)
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