Thousands of firefighters are working around the clock to stop a giant wildfire from spreading farther into Yosemite National Park. The Rim Fire doubled in a day. There are fears the fast-moving blaze could spread to the park's massive sequoias. Some of them are thousands of years old. Also in danger: thousands of structures and a reservoir that provides water to millions of people in San Francisco. 360's Gary Tuchman is in Yosemite with the latest.
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