(CBS/AP) LOS ANGELES - Police believe that the ex-cop being sought after he allegedly killed three people posted a "manifesto" to Facebook threatening "unconventional and asymmetrical warfare to those in LAPD uniform."
Thousands of police officers in California are searching for Christopher Dorner, 33, who allegedly murdered a young basketball coach and her fiancé over the weekend, then opened fire on police officers, killing one early Thursday.
"Unfortunately, this is a necessary evil that I do not enjoy but must partake and complete for substantial change to occur within the LAPD and reclaim my name," reads Dorner's statement.
Dorner was reportedly fired from the LAPD in 2008 for making false statements.
Authorities issued a statewide "officer safety warning," and police were sent to protect people named in the posting that was believed to be written by Dorner, who has military training. Among those mentioned were members of the Los Angeles Police Department.
Dorner's LAPD badge and an ID were found near San Diego's airport and were turned in to police at early Thursday, San Diego police Sgt. Ray Battrick said.
"We're asking our officers to be extraordinarily cautious just as we're asking the public to be extraordinarily cautious with this guy. He's already demonstrated he has a propensity for shooting innocent people," said LAPD Cmdr. Andrew Smith.
Dorner is wanted in the killings of Monica Quan and her fiance, Keith Lawrence. They were found shot in their car at a parking structure Sunday night, authorities said.
Quan's father, a former LAPD captain who became a lawyer in retirement, represented Dorner in front of the Board of Rights, a tribunal that ruled against Dorner at the time of his dismissal, LAPD Capt. William Hayes told The Associated Press Wednesday night.
According to documents from a court of appeals hearing in October 2011, Dorner was fired after he made a complaint against his field training officer, Sgt. Teresa Evans. Dorner said that in the course of an arrest, Evans kicked suspect Christopher Gettler, a schizophrenic with severe dementia.
Richard Gettler, the schizophrenic man's father, gave testimony that supported Dorner's claim. After his son was returned on July 28, 2007, Richard Gettler asked "if he had been in a fight because his face was puffy" and his son responded that he was kicked twice in the chest by a police officer.
In his manifesto, Dorner claims he was punished by the department because he had "broken their supposed blue line" by reporting on a fellow officer.