By james art 
More than 35,000 buildings were threatened Sunday by an out-of-control wildfire in Southern California that prompted evacuation orders and an emergency declaration from the governor, officials said.
The Line Fire, which ignited Thursday in the foothills east of San Bernardino, had burned 17,459 acres by Sunday morning and was 0 percent contained, according to the California Department of Forestry and Fire Prevention (Cal Fire). Multiple single-family and multi-family homes are among the structures threatened by flames, officials said.
Officials began issuing mandatory evacuation orders and warnings and declared a local state of emergency after the fire grew to more than 7,000 acres on Saturday. One of the evacuation orders was issued due to an “imminent threat to life” in an area of San Bernardino County from Calle Del Rio to Highway 38, including Greenspot Road North, the San Bernardino County Sheriff’s Office said in a statement.
Gov. Gavin Newsom also declared a state of emergency for San Bernardino County on Saturday, saying in a statement that California has secured assistance from the Federal Emergency Management Agency to help fight the fire. The request was approved by President Joe Biden on Saturday afternoon, Newsom said.
“I thank President Biden for his swift approval of support for the work of our firefighters and first responders fighting this fire and protecting local communities,” Newsom said. “It is extremely important that residents in affected areas remain vigilant and prepare to evacuate immediately if called upon by local authorities.”
The latest wildfires in the West: Firefighters battle 3 large fires, 2 in California
At least three firefighters were injured battling the blaze, according to Cal Fire.
As of Sunday morning, no structures were damaged or destroyed, Cal Fire said.
The cause of the fire remains under investigation.
The fire is being fueled by “critically dry” vegetation in the area and winds from thunderstorms that are “causing the Line Fire to behave very erratically,” according to Cal Fire.
The extreme heat enveloping Southern California is making it difficult for fire crews to fight the blaze, officials said.
“There will be a slight chance of showers and thunderstorms over the fire area today. Temperatures will range from the upper 80s to around 100 degrees and an excessive heat advisory remains in place throughout the day,” Cal Fire said in an updated statement Sunday.
More than 620 firefighters battled the blaze Sunday, including four helicopter fire crews, according to Cal Fire.
The Line Fire is one of 14 active wildfires burning in California as of Sunday, according to Cal Fire.
The Roblar fire
Among the other wildfires burning through California was the Roblar fire, which started Saturday afternoon near Marine Corps Base Camp Pendleton in San Diego County. The fire had grown to 856 acres by Sunday morning, burning mostly dry brush, according to Cal Fire.
The Roblar Fire was 0% contained on Sunday.
Davis’ fire
Another large wildfire burning in the West is the Davis Fire in Washoe County, Nevada, near Reno, officials said.
The Davis fire has destroyed 12 structures, burned 1,500 acres and prompted authorities to close part of Interstate 580, officials said. Nearly 10,000 customers were without power as local utility company EV Energy shut down power lines in the area to prevent the fire from spreading, officials said.
Red Flag fire conditions for Washoe County are in effect until at least 8 p.m. PT Sunday, officials said.
Amanda M. ABC News’ Morris contributed to this report.
More than 35,000 buildings threatened by wildfire east of Los Angeles originally appeared on abcnews.go.com