Sheriff’s deputies who believed they had cornered a fugitive ex-cop in the mountains above Los Angeles did not purposely torch a cabin where a nine-day manhunt ended, but the deputies may have ignited the blaze by firing tear gas, officials said on Wednesday. Former Los Angeles police officer Christopher Dorner, 33, was wanted in a killing spree targeting law enforcement officers that left four people dead. A man matching his description was surrounded in the San Bernardino National Forest on Tuesday.