Shots fired at Twentynine Palms Marines combat base in California

Authorities are investigation a reported accidental weapons discharge that sent a Southern California Marine Corps base into lockdown Monday afternoon.

“At this time, we can confirm that a weapon was inadvertently discharged,” the Marine Corps Air Ground Combat Center tweeted. “No injuries have been reported. This incident is under investigation.”

Marine Corps officials said earlier Monday that there were reports of shots being fired at the Marine Corps Air Ground Combat Center, also known as Twentynine Palms, in San Bernardino County. That led to a lockdown just before 9 a.m. local time after gunshots were heard, according to officials.

All personnel on the base were ordered to shelter in place. The order was lifted at 12:20 local time.

“The installation is secure and base personnel are free to resume activity,” the base tweeted.

The Marine Corps Air Ground Combat Center, in Twentynine Palms, Calif., is under lockdown. (Gregory Bull/)

The combat center, which was used for flight training during World War II, is home to one of the largest military training areas in the country.

About 12,500 active duty members are housed on the San Bernardino County base, which covers 1,100 square miles of mostly desert. Joshua National Tree Park is about 20 minutes away.