Yosemite wildfire one of the largest ever in California

The Rim Fire seen from the Pilot Peak Lookout near Yosemite National Park in California.
The Rim Fire seen from the Pilot Peak Lookout near Yosemite National Park in California. Credit: REUTERS/Mike McMillan/US Forest Service/Handout

A wildfire raging in Yosemite National Park in the US has now burned 184,481 acres, making it making it one of the largest on record in California.

Handout image of the Rim Fire in Yosemite National Park.
The fire is just 20 percent contained, the US Forest Service said. Credit: REUTERS/Mike McMillan/US Forest Service/Handout

A total of 4,081 fire personnel have been sent to tackle the Rim Fire, which is still just 20 percent contained.

An out building and pickup truck damaged by the Rim Fire.
An out building and pickup truck damaged by the Rim Fire continues to cause destruction. Credit: REUTERS/Mike McMillan/US Forest Service/Handout

The US Forest Service said the blaze's growth potential was "extreme" and its cause is currently under investigation.

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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.