IRVINE, Calif. (USA TODAY) - Police across Southern California waged a massive manhunt for a former cop accused of going on a revenge killing spree targeting other officers and their families and posting an online message saying "I do not fear death.''

Overnight shootings in Riverside County that left one officer dead and two wounded have been linked to the former Los Angeles officer, Christopher Dorner, who police named as a suspect in the slaying of a young couple here Sunday.

With sightings reported across the region, from San Diego to the San Bernardino mountains, Los Angeles Police Chief Charlie Beck called on Dorner to turn himself in: "This has gone far enough. Nobody else needs to die."

He said Dorner "has multiple weapons at his disposal, including assault rifles,'' and has police and military training.

A profanity-laced 11-page note addressed to "America" was written and posted online by Dorner, police chiefs in Irvine and Los Angeles said. In them, he laid out his grievances against the Los Angeles police department and various officers who he claims wronged him, ruined his law enforcement career and ultimately destroyed his reputation. He says he'll stop the killing when the LAPD publicly proclaims his innocence and restores his reputation.

"I have exhausted all available means at obtaining my name back," the manifesto says. "This is my last resort. The LAPD has suppressed the truth and it has now lead to deadly consequences.''

"Self-preservation is no longer important to me. I do not fear death as I died long ago on 1/2/09," he wrote, referring to the date of his police termination.

Beck said Los Angeles police have launched more than 40 security details to protect law enforcement personnel and others who they believe are targets, based on an Internet posting.

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Across Southern California, digital traffic signs carried alerts urging motorists to report any sight of Dorner, believed to be driving a Nissan Titan pickup and considered armed and dangerous.

"I don't think there's anybody in law enforcement who isn't looking for him, along with about half the commuters in Southern California,'' said San Diego police Detective Gary Hassen.

Beck said Dorner was threatening and targeting law enforcement officers specifically and in general.

"LAPD is a specific target, but all law enforcement is targeted,'' Beck said, adding that Dorner had "a vendetta against all Southern California law enforcement.''

READ:Suspect's 20-page manifesto

Police in San Diego early Thursday recovered a badge and ID bearing Dorner's photograph, Hassen said. The items were found by someone near the San Diego airport, given to a shuttle bus driver and passed to police, he said.

Also in San Diego, Hassen said a person matching Dorner's description attempted to steal a boat from a marina Wednesday night but abandoned the effort after he was unable to get the engine started and the boat unmoored. "We're waiting for forensic evidence to see if it was Dorner,'' Hassen said.

Police across the region were responding to reported sightings, and some proved to be mistaken. Beck attributed a pair of shootings by police officers in Torrance, south of Los Angeles, to mistaken identity. In one of the instances, officers fired on two women who were in a blue pickup delivering newspapers. .

There were numerous reports of sightings throughout the region. One was in the Big Bear community in the San Bernardino Mountains, east of Los Angeles, where a burned-out truck was found off an isolated road. San Bernardino County Sheriff's Deputy Zach Beckum said officers had not confirmed the truck was Dorner's.

The area was the focus of an intense ground search by law enforcement officers in tactical gear, and local schools were placed on lockdown. Bear Mountain ski resort closed its ski runs at mid-afternoon.

Riverside Police Chief Sergio Diaz said his two officers were stopped at a traffic light when they were hit with multiple gunshots fired from a rifle by someone in a truck that pulled up next to them. Killed was one 34-year-old officer with 11 years on the force. Another officer, 27, is expected to recover from his injuries, Diaz said.

Irvine Police Chief David Maggard named Dorner Wednesday night as the suspect in the slayings of Monica Quan, 28, an assistant basketball coach at California State University-Fullerton, and her fiance, Keith Lawrence, a University of Southern California campus security officer.

Quan is the daughter of Randy Quan, a retired LAPD captain who was involved in the review process that ultimately led to Dorner's dismissal from the force.

The couple were found dead of multiple gunshot wounds in their car outside their Irvine condominium Sunday night.

Maggard said Dorner implicated himself in the killings in the "manifesto" that included threats against several people, including members of the LAPD.

Beck, at a news conference, said he would not respond to the contents of the manifesto and dismissed it as self-serving "ramblings on the Internet.''

"When the truth comes out, the killing stops," the letter reads. "The attacks will stop when the department states the truth about my innocence. PUBLICLY!!! I will not accept any type of currency/goods in exchange for the attacks to stop, no do I want it. I want my name back, period. There is no negotiation."

The letter accuses the LAPD of corruption, racism and covering up for and promoting officers who steal and use excessive force. He identifies groups, including white, Asian, lesbian, black and Hispanic officers, who have acted in what he calls immoral ways as "high-value targets." The letter cites as one example of "high-value targets," black officers who belittle white officers under their command for "perpetuating the cycle of racism" in the LAPD.

"I am here to change and make policy," the letter reads. "The culture of LAPD versus the community and honest/good officers needs to and will change. I am here to correct and calibrate your morale compasses to true north."

"Dorner is to be considered armed and extremely dangerous, and we ask that anyone who sees Dorner, to not approach or attempt contacting him, but to immediately call 911 and notify law enforcement authorities,'' the LAPD statement said.

Two overnight shootings were linked to the investigation, the first in the city of Corona, where two LAPD officers were providing security. One officer was grazed by a bullet, Beck said.

MORE:Cal State Fullerton hoops coach, fiance shot to death

The slayings of Monica Quan and Lawrence shocked this suburban city that prides itself on having one of the lowest crime rates in the nation.

Randy Quan was the first Chinese-American to attain the rank of captain on the LAPD force, the department has said. He later served as chief of police at Cal Poly-Pomona, part of the California State University system.

Contributing: Donna Leinwand Leger in Washington