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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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Firecrews continue battle to contain Yosemite wildfire

The fire spreads towards a highway near Yosemite National Park. Credit: Reuters

A giant wildfire burning at the edge of Yosemite National Park has consumed 293 square miles and is 23 percent contained, US fire officials have said.

At least 111 structures have been destroyed and around 4,500 others are under threat as well as water supplies, and iconic giant sequoia trees.

Smoke from the fire, which is one of the largest wildfires in California's history, billows in the sky Credit: Reuters

Forestry experts have said long intervals between wildfires and years of drought primed the Sierra Nevada mountains are contributing factors behind the blaze.

A charred caution sign Credit: Reuters

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