armed cop turned killer. the search focussess on the noee mountains of big bear lake. police found his burned out pickup truck. a police spokesman says they do not know what dorner will do next but they know what he's capable of and they need to find him quickly. william la jeunesse live in los angeles with more on this very tense search. william. >> reporter: well, jon, we believe this is the largest manhunt in lapd history. the irony of course the fugitive was one of their own who was fired for lying about another officer, and now he is targeting his former colleagues with revenge. as you said the focus is 80 miles east of los angeles in the ski resort of big bear. it is very cold, the weather is deteriorating there right now. for the last 24 hours it's been in lockdown. the schools are closed, the slopes are open but there have been 120 law enforcement there on foot, in helicopters, with thermal cameras basically looking for this guy. we don't know if he is hiding