LOS ANGELES — Police have launched a massive manhunt for a former Los Angeles officer suspected of going on a killing spree, slaying a couple over the weekend and then ambushing two police officers early today, killing one.

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.

A badge and identification belonging toDornerwere found in San Diego today.

San Diego police Sgt. Ray Battrick says Christopher Dorner's LAPD badge and ID were found by a citizen near the city's airport.

Battrick says the items were turned in to police at 2:27 a.m. today but he does not know when they were found.