A huge fire started last week in and around California’s Yosemite National Park. It has continued to spread and covers more than 250sq miles according to official sources.
A state of emergency has been declared by the Governor of California, Jerry Brown, and has forced thousands of tourists and residents to leave.
More than 2,000 fire-fighters have been mobilised to fight the fire which is now raining ash on a key reservoir supplying water and hydroelectric power to the city of San Francisco.
Strong winds blowing over the county are making the fires extremely difficult to control and stop.
Daniel Berlant of the California Department of Forestry and Fire Protection said "This fire has continued to pose every challenge that there can be on a fire".
The fires started on 17th August in the Stanislaus National Forest and the cause is still unknown.
Video :Fire near Yosemite triples in size overnight, kcratv