One Marine was killed and another taken into custody after a fight broke out at Camp Pendleton’s School of Infantry on Tuesday, according to a Marine official.

The San Diego Union-Tribune reported that the Marine was fatally stabbed.

“An NCIS [Naval Criminal Investigative Service] investigation has been opened, and is currently ongoing,” Marine Capt. Joshua Pena, a spokesman for the Corps’ Virginia-based Training and Education Command, told Marine Corps Times Tuesday.

Private First Class Ethan A. Barclay-Weberpal, assigned to Lima Company, Headquarters and Services Battalion at SOI-West, was killed in the incident, Pena said. He was 18-years-old and had just entered the Corps in July.

Pena said the incident occurred “aboard Marine Corps Base Camp Pendleton, California, at the School of Infantry West.”

Pena declined to offer any other information.

“The name of the Marine in confinement, also assigned to the same unit, will not be released at this time,” Pena said.

This story was first reported by the San Diego Union-Tribune.