Los Angeles police are on tactical alert as they search for an ex-officer suspected of twice opening fire on officers after being named as a double-murder suspect.
Police Cmdr. Andrew Smith says the department has taken such protective measures as reassigning motorcycle officers to cars.
There were two separate overnight shootings about 60 miles east of Los Angeles in Riverside County that investigators believe involved former LA police officer Christopher Dorner, who's also the main suspect in the weekend killing of a couple whose bodies were found in Irvine. He was fired in 2008 for making false statements.
The first occurred in the city of Corona and involved two LAPD officers working a security detail, said Sgt. Alex Baez of the LAPD's Newton division. One officer was grazed.
Later, two officers on routine patrol in the neighboring city of Riverside were ambushed in their patrol car at a stop light, said Riverside Lt. Guy Toussaint. One died and the other was in surgery.
The Riverside officers shot overnight were not actively looking for Dorner, Toussaint 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. We can't provide a lot of information now because we're trying to capture him," said Cmdr. Andrew Smith. "We don't know where he is. We're looking for the public's help to locate this guy. Anybody who sees him or believes they see him or his vehicle should call 911."
Donor's LAPD badge and ID were found by a citizen near the city's airport Thursday morning. according to San Diego police Sgt. Ray Battrick . Battrick said the items were turned in to police at 2:27 a.m. Thursday but he does not know when they were found.
Dorner is wanted in the killings of Monica Quan and her fiance, Keith Lawrence, who were found shot to death in their car at a parking structure Sunday night, Irvine police Chief David L. Maggard said at a news conference Wednesday night.
PDF: Christopher Dorner's manifesto http://bit.ly/X9N3Cz
Dorner, 33, implicated himself in the killings with a multi-page "manifesto" that he wrote that included threats against several people, including members of the LAPD, police said. Dorner lists several cities he has lived in, including Thousand Oaks. It was not specified when or for how long he lived in each city.
Autopsies showed that Quan and Lawrence were killed by multiple gunshot wounds in the parking structure at their condominium in Irvine, Orange County sheriff's spokesman Jim Amormino said earlier Wednesday.
Lawrence was a former Moorpark basketball star, and Quan was a former California Lutheran University assistant women's basketball coach. The two met while playing at Concordia University in Irvine and became engaged two weeks ago, according to family members.
Lawrence was a public safety officer at the University of Southern California.
Campuses where the couple worked issued statements Monday expressing grief. Counselors at the Fullerton campus plan to work with staff members and student athletes who may be struggling with the loss, according to university President Mildred García.
Quan's father, Randal Quan, a former Los Angeles Police Department 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, Los Angeles police Capt. William Hayes told The Associated Press.
Police said Dorner's manifesto included threats against members of the department.
"We are looking at the manifesto and will do an assessment in terms of the threat against those listed in it, and determine what level of protection each of them will need," Hayes said.
According to documents from a court of appeals hearing in October 2011, Dorner was fired from the Los Angeles Police Department after he made a complaint against his field training officer, Sgt. Teresa Evans, saying in the course of arrest, she kicked suspect Christopher Gettler, a schizophrenic with severe dementia.
After an investigation, Dorner was fired for making false statements.
Anyone who sees Dorner is asked to call 911. Anyone with information on his whereabouts is asked to call the Irvine police tip line at 949-724-7192 or to email email@example.com.
Shaya Tayefe Mohajer, Tami Abdollah, Cindy Von Quednow and The Associated Press contributed to this report.