The wildfire threatening Yosemite National Park spreads further into the US tourist landmark. The Rim Fire, which has grown to become California’s sixth biggest wildfire ever, now covers more than 300 square miles. It also threatens San Francisco’s water supply because of ash falling on a key reservoir. The blaze started west of the park on August 17.On Wednesday, it forced the closure of a second main road into the national park. A surge of visitors is typically expected over this weekend’s Labor Day holiday at Yosemite, which draws millions of tourists every year. By Thursday the fire burned through some 45,000 acres inside the park. Officials though say there’s no risk it will reach Yosemite Valley, the park’s main tourist area.
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