California wildfire: Rush to save 4,500 buildings, San Fransisco's water, Yosemite
California's giant "Rim" wildfire has entered Yosemite National Park and is threatening 4,500 buildings in the area. Officials are concerned that the water in the Hetch Hetchy reservoir has been contaminated with smoke. The reservoir supplies drinking water for 2.6 million people in the San Francisco area. Teresa Garcia reports.