Firefighters continued to battle a fire Sunday in San Bernardino County, dubbed the South Fire that had burned 819 acres and was 49% contained as of Monday. Evacuations and road closures have been lifted.

The fire, reported near Fontana at 1:36 p.m. Wednesday, destroyed 18 structures, and some 400 firefighting personnel were engaged in battling the flames. The cause of the fire was under investigation.

On Sunday afternoon, authorities downgraded the evacuation orders for the Lytle Creek area to an evacuation warning, according to the San Bernardino County Sheriff's Department. The area was only open to residents who had to show ID to be allowed in. The evacuation warning for Rosena Place had also been lifted, authorities said.

More than 1,000 people were evacuated Thursday evening, and a Red Cross evacuation center was opened in Fontana, according to California's Office of Emergency Services. 

The Jessie Turner Center, at 15556 Summit Ave., was expected to remain open for 24 hours, the sheriff's tweeted Sunday afternoon.

North Etiwanda Preserve remained closed due to the fire until further notice, according to Rancho Cucamonga Fire.

With the Lytle Creek Post Office closed due to the fire, residents were advised to pick up mail at the Fontana Post Office.  

Authorities were urging residents in the mountain and foothill areas to stay informed of weather forecasts. To do so, residents can register their cell phone numbers with the Telephone Emergency Notification System / Swift 911 and have an emergency plan. Visit www.sbcounty.gov for more emergency preparedness information.