Fire personnel tackle Yosemite blaze from the skies

The California Air National Guard has released a video of it tackling the wildfire at Yosemite National Park, which is now one of the largest ever in California:

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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.