A US MARINE combat center has been placed on lockdown following reports of an active shooter.

Officials at the Marine Corps Air Ground Combat Center Twentynine Palms in San Bernardino County, California, said they received calls of shots fired on the base grounds at 8.52am on Monday.

Marine officials said the facility entered a lockdown state as they investigated the reported shooting.

"We have received reports of shots fired on board MCAGCC. The MCAGCC Provost Marshals Office is currently responding to the situation," MAGTF tweeted.

"The installation has entered a lockdown state and all personnel are required to shelter in place."

The Marine Corps said the call came through anonymously.

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It's unclear if anyone was injured in the shooting.

The MCAGCC, also known as 29 Palms, is the largest Marine Corps base in the United States.

The base is used as a training ground for the US Maine consisting of live-fire, artillery, tank and close air support exercises.

The terrain is consistent with steeply sloped mountains and flat valleys running northwest-southeast, with elevations ranging from 1,800 to 4,500 feet above sea level.

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