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CAMP PENDLETON, Calif. – A brush fire broke out on Camp Pendleton shortly after noon Friday.

Smoke from the fire, which was reported at Basilone Road between the San Luis Rey and Fallbrook gates on the Marine base, was visible in the Fallbrook area, but officials with North County Fire District said the blaze did not pose a threat to any structures off of the base.

The fire had consumed about 15 acres at a training range deep inside the base by 12:42 p.m., according to the Camp Pendleton Fire Department. It was not threatening structures or communities in or off the base, base spokeswoman Cpl Shellie Hall said in an email.

Marine firefighters set a controlled backfire to clear about dry brush around the wildfire, base officials said.  In all, about 100 acres were blackened., they said.

The cause of the fire was not immediately known.