According to a law enforcement source, police had broken down windows, fired tear gas into the cabin and blasted over a loud speaker, urging Dorner to surrender. When they got no response, police deployed a vehicle to rip down the walls of the cabin "one by one, like peeling an onion," a law enforcement official said.
By the time they got to the last wall, authorities heard a single gunshot, the source said. Then flames began to spread through the structure, and gunshots, probably set off by the fire, were heard.
As darkness descended on the mountainside, Dorner's body had not been found, authorities said. Police were planning to focus their search in the basement area, the source said.