Firefighters worked Monday to subdue a wildfire that has blackened about 1,000 open acres on the grounds of Camp Pendleton. The blaze, dubbed the Roblar Fire, erupted in the northeastern

reaches of the northern San Diego-area Marine Corps base on Saturday, Cal Fire reported. As of Monday afternoon, military and civilian crews had the burn area about 20% contained, according

to Camp Pendleton public affairs. The fire caused no reported structural damage or injuries and posed no threats to developed areas on or off the USMC installation, officials said. _City

News Service contributed to this article. _