CAMP PENDLETON, Calif. (KGTV) - A brush fire broke out in a training range on Camp Pendleton Friday, creating a plume of smoke visible above North San Diego County.

The fire started at 11 a.m. near the center of the base in the Basilone/San Mateo area, officials said. By 3:30 p.m., 50 acres had burned.

Helicopters were deployed to drop water and fire retardant.

Ground crews from Camp Pendleton and Orange County Fire also battled flames in 90-degree weather.

Officials said there were no structures threatened by the fire.