Yosemite fire threatens San Francisco water supply

A huge wildfire near Yosemite National Park in California has continued to threaten San Francisco’s water supply, while firefighters warned it was so hot that it could send sparks into new, untouched areas.

The fire, covering more than 230 square miles and burning near one of the country’s most popular national parks, edged closer to a the source of San Francisco’s drinking water and to some of the giant sequoia trees that are among the largest and oldest living things on earth.