The so-called Broad Fire erupted around 9:30 a.m. near PCH and Malibu Canyon Road, close to Pepperdine University, and scorched about 50 acres. So far, there have been no immediate reports of injuries.
As of early Wednesday afternoon, the fire's "forward progress (was) stopped,'' the Los Angeles County Fire Department said in a statement. "Fire held at 50 acres with 15% containment.''
Malibu city officials urged residents in the area to shelter in place, but warned them to be prepared for potential evacuations.
All lanes of PCH were closed from Corral Canyon to Webb Way, and backup power generators for traffic signals were staged in the area, Malibu city officials reported on X.
Video from the scene showed flames burning in one home, and county fire officials said later a second structure was also impacted by the fire.
The fire erupted amid a red flag warning of critical fire danger due to fierce Santa Ana winds and low humidity.
Nearby Pepperdine University reported no impact on its operations, although it advised students of the road closure in the area.