A wildfire blackened scores of brushy acres in an open training area at Camp Pendleton Thursday afternoon.
The blaze began spreading about noon off Basilone Road, near the center of the 195-square-mile Marine Corps installation north of Oceanside, according to the base's public-affairs office.
By mid-afternoon, the burn zone had grown to about 350 acres, said Gunnery Sgt. Leo Salinas, a Camp Pendleton spokesman. But there were no reports of structural threats or injuries, he said.
The cause of the fire was not immediately clear.