A fast-growing wildfire in Hesperia has prompted evacuations Saturday night.

The Hesperia Fire was first reported around 6 p.m. in the 18000 block of North Highway 173, according to CAL FIRE San Bernardino.

By 8 p.m, it grew to over 300 acres. By 9 p.m., it was over 500 acres and by 10:30 p.m., it was over 700 acres.

An evacuation warning is in place for the Lake Arrowhead Estates community near Highway 173 and Arrowhead Lake Road. Road closures in the area have also been issued by California Highway Patrol.

Firefighters and air crews have responded to the scene to battle the blaze. As of 10 p.m., the fire was at zero percent containment.

The cause of the vegetation fire remains under investigation. Officials said the expansion remains wind-driven and continues burning north.

“Crews from the ground and air continue to work on permittee control, containment lines and structure protection,” said the San Bernardino County Fire Department.

A poor air quality warning due to smoke from the fire was issued by the Mojave Desert Air Quality Management District on Saturday night.

This advisory covers San Bernardino County and will remain in effect through Sunday, June 16.

“This advisory may be extended or amended further, consistent with smoke and fire behavior, firefighting efforts, NWS and air quality forecasts,” officials said.

Residents living in the area were urged to take precautions. Those most susceptible to issues from unhealthy air include children, the elderly and people with heart and respiratory illnesses.

In areas impacted by smoke or poor air, residents should:

• Consider avoiding any vigorous outdoor or indoor exertion
• Keep windows and doors closed
• Run your air conditioner if you have one – recirculation function is ideal
• Avoid using a swamp cooler or whole-house fan to prevent bringing outdoor pollutants inside.
• People with respiratory or heart disease, older adults, and children should remain indoors

More information from CAL FIRE can be found here.

On Saturday night, firefighters continued to battle the Post Fire that ignited near the 5 Freeway in Gorman. That fire has grown to over 4,400 acres.

This developing story will be updated as more information becomes available.

A rapidly growing third alarm fire near the 5 Freeway in Gorman is threatening structures and forcing evacuation orders, according to authorities.

According to the Los Angeles County Fire Department, the fire was reported at 1:48 p.m. As of 2:40 p.m., it was spread across 500 acres.

The fire was reported to be on the side of the southbound lanes of the 5 Freeway, though the department said the freeway was not on fire.

Structures were being threatened and evacuations were in place, though it wasn’t immediately clear which structures and what specific areas were evacuated, and whether any containment had been made.

Gorman is a small unincorporated area in northwest L.A. County and is a common stopping place for food and gas along the 5 Freeway.

A mountain lion was killed on the 101 Freeway early Saturday morning. 

Preliminary information indicates that the deceased mountain lion was blocking lanes on the southbound side of the freeway near Liberty Canyon Road in Agoura Hills around 5 a.m. 

The predatory feline died just half a mile from the Wallis Annenberg Wildlife Crossing construction site, which is set to open in 2026, California Gov. Gavin Newsom said last month. 

California Highway Patrol officers moved the mountain lion to the right shoulder of the freeway so traffic could pass through. 

The California Department of Fish and Wildlife will investigate the death of the mountain lion, which was not wearing a tracking collar.