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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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Firefighters rush to protect unique giant sequoias

Sacramento Metropolitan firefighter John Graf monitors the Rim Fire line near Camp Mather, California. Credit: Reuters

The Rim Fire has threatened two groves of giant sequoias that are unique in the region, prompting park employees to clear brush and set sprinklers around the huge trees.

Firefighters have been battling the huge blaze. Credit: Reuters

While sequoias have a chemical in their bark to help them resist fire, they can be damaged when flames move through slowly.

The wildfire in Yosemite National Park and surrounding areas has now burned 149,780 acres - an area larger than the city of Chicago. Credit: Reuters

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