A wildfire fueled by high heat has so far charred at least 5,000 hectares in the Santa Clarita Valley area of California, USA.
The brush fire broke out along the northbound Antelope Valley Freeway around 14:00 on Friday, near Sand Canyon Road in Santa Clarita.
Hot and dry temperatures coupled with gusts of up to 40 mph (about 64 km per hour) helped the fire burn more than 800 hectares overnight.
Residents were reporting of smoke-filled air and falling ash in many parts of the greater Los Angeles area, and at least one building is believed to have been damaged or destroyed. No injuries were reported as a result of the blaze, said the authority.
Fewer than 100 people were evacuated from the area of Capra Road off Soledad Canyon Road because of the flames, county fire officials said.
Residents of between 200-300 homes in the area were also under a mandatory evacuation order, according to the sheriff's department. An emergency shelter for residents has been set up at a high School.
"So far we have evacuated 100 homes, which equates to about 300 people. They are located here at the Golden Valley High School evacuation center." said Burton Brink, sergeant, County of Los Angeles Sheriff's Department.
About 300 firefighters were battling the flames from the ground and air. The Los Angeles Fire Department sent a water-dropping helicopter to join the county fire department. Eight fixed-wing firefighting aircraft were also called in to control the blaze.
A smoke advisory was issued through midnight Sunday for the San Fernando, San Gabriel and Santa Clarita valleys, San Gabriel Mountains, Pomona/Walnut Valley, and the central Los Angeles area, as smoke from the fire drifted southeast toward Los Angeles.
The South Coast Air Quality Management District said those areas were susceptible to direct smoke impact and unhealthy air quality, and recommended that people stay indoors and avoid using swamp coolers and wood-burning appliances.