A million-dollar bounty has been put on the renegade ex-police officer wanted for killing three people in California.
Meanwhile police have been working to protect dozens of families considered targets based on Christopher Dorner's Facebook rant against those he held responsible for ending his career with the Los Angeles Police Department five years ago. Among the 33-year-old's victims is a police officer.
"Our dedication to catch this killer remains steadfast. Our confidence remains unshaken," Los Angeles Mayor Antonio Villaraigosa said alongside police chiefs and mayors from the towns of Irvine and Riverside. "We will not tolerate this reign of terror."
Several tips came in within a few hours after the award announcement, including a reported sighting that had police surrounding and evacuating a DIY store in LA's San Fernando Valley. A search drew a blank.
After days without resolution, Dorner's freedom caused concern among some and downright fear among others in Irvine, an upmarket community that the FBI consistently ranks among the safest cities in the US
"If he did come around this corner, what could happen? We're in the crossfire, with the cops right there," said resident Joe Palacio, who lives down the street from the home surrounded by authorities protecting a police captain mentioned in Dorner's posting. "I do think about where I would put my family," he said. "Would we call 911? Would we hide in the closet?"
The neighbourhood has been flooded with authorities since Wednesday. Residents have seen police helicopters circle and cruisers stake out schools. Some have responded by keeping their children home. Others no longer walk their dogs at night.
Police also were looking into a taunting phone call to the father of the woman they believe Dorner killed last week. Two law enforcement officers said they are trying to determine whether Dorner made the call telling retired police Captain Randal Quan that he should have done a better job protecting his daughter.
The bodies of Monica Quan and her fiance were found shot dead on Sunday of last week in Irvine, marking the start of the high-profile case.
Things escalated early on Thursday, when police say Dorner got into a shootout with police in Corona, grazing an LAPD officer's head with a bullet before escaping. Authorities believe he then used a rifle to ambush two Riverside police officers, killing one and seriously wounding the other.