QUANTICO, Va. - Officials said a Marine killed a male and female colleague at a base in Virginia before committing suicide.

Base spokesman Lt. Agustin Solivan said 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. They found a second victim dead along with the suspect who they said died of a self-inflicted gunshot wound.

No names have been released but Solivan said all three of the dead are Marines.

Solivan said 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.