The La Tuna Canyon fire burns in the hills above Burbank, California, September 2, 2017. (Photo by AFP)
A wildfire on the northern edge of Los Angeles rapidly grew on Saturday into what the mayor called the largest blaze in the city's history, prompting the evacuation of hundreds of people and the closure of a major highway.
The 5,000-acre (2,023-hectare) La Tuna Fire, named after the canyon area where it erupted on Friday, has led authorities to evacuate more than 700 homes in a north Los Angeles neighborhood and in nearby Burbank and Glendale, officials said.
Authorities warned of erratic winds that could force them to widen the evacuation zone, after the fire destroyed three houses in Los Angeles on Saturday.
Residents on the 210 freeway try to see if their house and two of their cats on the other side of thick smoke and flames might burn near the community of Tujunga during the La Tuna Fire, September 2, 2017 near Burbank, California. (Photo by AFP)
"Other than that, no loss of any property," Los Angeles Mayor Eric Garcetti said at a news conference. "That is a pretty amazing thing."
The fire was only 10 percent contained with more than 500 firefighters battling it.
The blaze in thick brush that has not burned in decades was slowly creeping down a rugged hillside on Saturday toward houses, with temperatures in the area approaching 100 degrees Fahrenheit (38 degrees Celsius), the Los Angeles Fire Department said in an alert.
"This fire, which broke out yesterday, we can now say is the largest fire in the history of L.A. city, in terms of its acreage," Garcetti told reporters.
On Saturday night, Garcetti declared an emergency, ordering "all available resources" deployed to protect residents and property.
A blow-up during the two-day-old La Tuna fire sends a dark plume of smoke and flames toward homes in the hills just off Glenoaks Boulevard in Sunland. (Photo via dailynews.com)
"This declaration also requests that the Governor declare an emergency - so that state and federal assistance can be provided to the City as quickly as possible,” Garcetti said in a statement.
The fire could make air unhealthy to breathe in parts of Los Angeles, the nation's second-largest city, and nearby suburbs, the South Coast Air Quality Management District said in an advisory.
Video posted online by media showed the fire burning along the 210 Freeway when it broke out on Friday, with smoke hovering over the roadway as cars passed by flames a few dozen feet away. Officials quickly closed a stretch of the freeway.
Flames descend down a hillside and toward a home on a street in Sunland. (Photo via dailynews.com) 
More than 400 miles (644 km) to the north, the so-called Ponderosa Fire has burned 3,880 acres, or about 1,570 hectares, and destroyed 32 homes in Butte County since it broke out on Tuesday. It prompted authorities to issue evacuation orders earlier this week to residents of some 500 homes.
The blaze was 51 percent contained.
California Governor Jerry Brown issued an emergency declaration on Friday to free up additional resources to battle the Ponderosa blaze.
Wildfires in the US West have burned more than 7.1 million acres (2.9 million hectares) since the beginning of the year, about 50 percent more than during the same time period in 2016, according to the National Interagency Fire Center.

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