The deadly L.A.-area fire blazing along 20 miles has claimed over 70 homes so far, and is threatening 12,000 more. The fire is encroaching upon Mt. Wilson, which houses the region's TV and cell phone towers, as well as a historic observatory. All firefighters have been evacuated from the mountain. The fire doubled in size overnight and was burning over 100,000 acres Monday evening. It has killed two firefighters and destroyed at least 74 structures. Officials estimate property damage so far at $7.6 million. More than 2,800 firefighters, eight tankers, and 12 helicopters are battling the blaze.