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Photo: The Canadian Press. All rights reserved.

San Bernardino County sheriff's deputies search a home during a manhunt for former Los Angeles officer Christopher Dorner in Big Bear, Calif, Thursday, Feb. 7, 2013. (AP Photo/Jae C. Hong)

Law enforcement officials continued a massive manhunt with three states and Mexico on alert Friday in search of a fired police officer who threatened to bring "warfare" to the Los Angeles Police Department and went on a shooting rampage that left a policeman and two others dead.

The search Thursday for Christopher Dorner led hair-trigger officers to mistakenly shoot at innocent citizens and forced police to guard their own.

As darkness fell, the search that had extended across California from the U.S.-Mexico border through Nevada, from suburban streets to military bases, had narrowed in on a cold, snowy mountain 80 miles (130 kilometres) east of Los Angeles where Dorner's burned truck was found.

San Bernardino County Sheriff John McMahon said 125 officers were going door to door and attempting to track the suspect, and that a SWAT team was providing added security to those in the community. Schools were put on lockdown while investigators examined the vehicle and spread out across the area.

"He could be anywhere at this point, and that's why we're searching door to door," McMahon said, adding that the manhunt would continue "as long as we can." A snow storm was expected in the region with temperatures dipping into the teens overnight.