A police officer that was fired, who threatened to declare "war" on the Los Angeles Police Department, undertook a series of shootings that left three people dead and wounded two others in attacks in Orange and Riverside counties.
The killings sparked an extraordinary operation to locate and capture him on Thursday, which involved at least three states and even northwestern Mexico.
Officials have issued a Big Bear Lockdown due to snow and the ongoing manhunt for ex-LAPD officer Christopher Dorner. The Big Bear Lockdown insists that residents and visitors stay indoors during the manhunt for Dorner.
During the day, thousands of heavily armed police traveled roads in the state and others stood guard outside homes of people.
According to authorities, Dorner promised to attack police in a text that was published online.
"I will bring unconventional and asymmetrical warfare to those in LAPD uniform whether on or off duty," he allegedly wrote in a document provided to CNN.
Captain Terry McMagnus of the San Diego Police Department said that apart from U.S. law enforcement agencies seeking the extremely dangerous Christopher Dorner, his office has contacted police links across the border.
Meanwhile, Tijuana municipal police confirmed they have received several requests to search for Dorner from police departments in San Diego, Los Angeles and Riverside.
By sunset on Thursday, official weapons experts also scoured the woods of Big Bear in the mountains of San Bernardino.