UK & World News
California Wildfire Threatens Yosemite Park
A giant wildfire has spread into Yosemite National Park and triggered a state of emergency in San Francisco.
The fire, which started a week ago, closed hiking in the park but is not currently threatening the popular Yosemite Valley region.
It grew from 99 square miles to more than 165 square miles overnight and was only 2% contained.
Smoke billowing across the Sierra Nevada forced officials in several counties to cancel outdoor school activities and issue health warnings for people with respiratory problems.
Daniel Berlant, a spokesman for the California Department of Forestry and Fire Protection, said: "Most of the fire activity is pushing to the east right into Yosemite."
California Governor Jerry Brown declared an emergency for San Francisco 150 miles (240 kilometers) away, because of the threat to utility transmission to the city.
The fire also caused smoke warnings and event cancellations in Nevada as smoke blew over the Sierra Nevada and across state lines.
The fire is threatening around 4,500 homes, according to the US Forest Service.
Officials issued voluntary evacuation advisories for two new towns on Friday.
A mandatory evacuation order remained in effect for part of Pine Mountain Lake.
Already, the blaze has destroyed four homes and 12 outbuildings in several different areas, according to US Forest Service spokesman Jerry Snyder.
One firefighter has been injured tackling the blaze.
The spectacular Yosemite Valley offers visitors iconic sights including the Half Dome and El Capitan rock formations, as well as Bridalveil and Yosemite falls.