LAS VEGAS (AP) -- A lightning-sparked fire near Las Vegas has grown to nearly 14,000 acres as it burns through bone-dry trees and vegetation.
Officials say the uncontrolled blaze prompted evacuations of more than 500 people and left a blanket of smoke over the city.
U.S. Forest Service spokeswoman Julie Thomas says no injuries or damage to structures were reported.
The Clark County Department of Air Quality extended a health advisory for smoke and ground-level ozone through Sunday around Las Vegas.
Some 600 firefighters were battling the blaze with the help of an aerial assault involving five helicopters and five air tankers, but they're hampered by steep, rugged terrain, temperatures in the upper 90s and wind gusts of up to 40 mph.
The fire advanced to within a mile of homes and Thomas says evacuees will not be allowed to return until crews gain the upper hand.