Officials say a Marine killed a male and female colleague at a base in Virginia before committing suicide.
Base spokesman Lt. Agustin Solivan says it began around 11 p.m. with a shooting that killed one at Marine Base Quantico. The suspect then barricaded himself inside the barracks, prompting a standoff with authorities.
Authorities eventually entered the barracks early Friday and found a second victim dead along with the suspect dead of a self-inflicted gunshot wound.
No names have been released, but Solivan says all three of the dead were Marines.
All three were staffers of the Officer Candidate School on the base, reports CBS Washington, D.C. affiliate WUSA-TV. Quantico officials confirmed to the station that the incident was confined to a single barrack at the school.
Solivan says the shooting was an isolated incident and authorities are confident there are no other casualties.
The base was put on lockdown after the shooting but the lockdown has been lifted. During the lockdown, residents were warned over a loudspeaker to stay inside.
The base, which is about 37 miles south of Washington, is also home to the FBI's training academy.
In 2010, the base was one of several targets of an ex-Marine reservist who, during five nighttime shootings, fired on military targets including the Pentagon. Yonathan Melaku, on two separate occasions, fired at the National Museum of the Marine Corps in Quantico. No one was injured and Melaku was ultimately sentenced to 25 years in prison.