|Hundreds of firefighters are battling the fire in California|
Hundreds of people have fled their homes in Los Angeles to escape a fire described as the biggest in the city's history.
The blaze started on Friday and spread rapidly on Saturday, forcing the closure of a major road and the evacuation of about 730 homes in northwest Los Angeles and nearby Burbank and Glendale.
Mayor Eric Garcetti said the fire had already burnt 5,000 acres (2,000 hectares), adding: "In terms of acres involved this is probably the largest fire in LA city history."
The La Tuna Canyon fire burns in the hills above Burbank, California
An Erickson Air Crane firefighting helicopter drops water over the fire
|The La Tuna Canyon fire burns in the hills above Burbank, California|
Late on Saturday afternoon local time, he said firefighters were dealing with "very erratic weather and wind".
Residents on the 210 freeway prepare to make their escape
"Our biggest concern is the wind and weather," he said.
"The erratic weather is our number one challenge.
"If there's no wind, this is a relatively easy fire to put out.
But strong winds are forecast, with temperatures expected to climb into the late 30s.
Hundreds of homes, such as these ones, are being evacuated due to the fire
More than 500 firefighters are trying to control the fire and 100 others, who were sent to Houston to help that city through flooding, have been called back to California.
There have been no deaths or injuries reported and, despite the fire's size, only three houses have been destroyed.
There are concerns that the fire could make it difficult for people to breathe in Los Angeles, the country's second-largest city, according to a warning from the South Coast Air Quality Management District.
|An Erickson Air Crane firefighting helicopter drops water over the fire|
Meanwhile, 400 miles north, the Ponderosa Fire has burned 3,880 acres and destroyed 30 homes in Butte County since Tuesday.
Firefighters are even being called back from Houston to help
Around 500 homes were evacuated due to the blaze, which grew from a camp fire and is now 45% contained.
A man has been charged with two counts of arson.
Wildfires are also raging in other states, including Montana, Oregon, Washington, Wyoming and South Dakota.