A motor home caught fire Saturday afternoon on the Golden State Freeway north of Castaic, setting nearby brush ablaze and charring five acres, Los Angeles County fire officials said.
Firefighters spent an hour and a half battling the fire, which broke out about 2:30 p.m. near the freeway and Templin Highway, county fire spokesman Art Marrujo said.
No buildings were damaged in the blaze and no homes were evacuated, Marrujo said.
By the time California Highway Patrol officers arrived at the fire, the motor home was fully engulfed in flames and had ignited nearby brush, CHP Officer Karen Faciane said.
The fire raced up a nearby hillside, she added, forcing the CHP to briefly close one northbound lane.
Authorities said they did not know what caused the motor home to catch fire.
Another fire, near Val Verde northwest of Santa Clarita, burned 15 acres of brush before about 80 county firefighters brought it under control shortly before 6 p.m., officials said.
That blaze, near the 30200 block of Lexington Drive, broke out shortly after 3 p.m. No structures were damaged, officials said.