SAN DIEGO -- Firefighters worked Monday afternoon to stop the spread of a brush fire in the San Pasqual Valley not far from the San Diego Zoo Safari Park.
The fire was reported before 1:30 p.m. near Bandy Canyon and Old Survey roads.
Helicopter video shows that the fire, which may have started near a road, quickly climbed a grassy hillside.
Cal Fire sent at least a dozen wildland fire trucks to the fire. While ground crews deployed on the flanks of the fire, helicopters and fixed-wing air tankers dropped water and fire retardant on the advancing flames.
As of 4 p.m., the fire had charred about 12 acres of grassland and 40 percent was contained, Cal Fire said.
No structures were immediately threatened by the fire. The cause of the fire was under investigation.