CAMP PENDLETON, Calif.—A Camp Pendleton-based U.S. Marine died this week during a nighttime training exercise at the northern San Diego County military installation, a U.S. Marine Corps (USMC) official confirmed on Aug. 18.

The fatality took place on Ag. 17, said Maj. Joshua Pena, director of Communication Strategy and Operations, Marine Corps Training and Education Command.

The deceased serviceman’s identity and details on the circumstances of his death remained unavailable Friday afternoon.

The Marine was a student at the entry-level Basic Reconnaissance Course at the USMC School of Infantry West, Mr. Pena said.

An investigation into the fatality was underway, according to the Marine Corps.

“The family has our deepest condolences as we continue to work with them during this difficult time,” Mr. Pena stated.