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Yosemite fire 'size of Chicago'

A wildfire in Yosemite National Park in the US state of California has spread to almost 150,000 acres, according to fire service officials. A state of emergency has been declared for San Francisco after power lines servicing the city were threatened.

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Almost 150,000 acres burned in Yosemite wildfire

California's fire service reports that the wildfire in Yosemite National Park and surrounding areas has now burned 149,780 acres - an area larger than the city of Chicago.

Firefighters have been trying to bring the flames under control since last week but have only contained 15 percent of the fire.

NBC Bay area reports that 23 structures gave been burned, but that 4,500 are threatened.

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