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Photo: The Canadian Press. All rights reserved.

The Marine Base Quantico, spokesman Lt. Agustin Solivan briefs reporters following a shooting incident on the base Friday March 22, 2013. (AP Photo/Matthew Barakat)

A Marine killed a male and female colleague in a shooting at a base in northern Virginia before killing himself, officials said early Friday.

Authorities were called to the scene at Marine Corps Base Quantico around 10:30 p.m. Thursday, where they found one Marine dead at a barracks, base commander Col. David W. Maxwell told reporters.

Authorities later found a second victim dead, along with the body of the suspected gunman, who died of self-inflicted gunshot wound.

A base spokesman initially described the situation as a standoff. Maxwell said later in the morning that there was no standoff. Base spokesman Lt. Agustin Solivan later clarified that after the first shooting, police had the shooter "isolated" in a barracks dorm room at the base's Officer Candidates School.

No names were immediately released but officials said all three were staff members at the school.

Solivan said the shooting was isolated to the school and authorities were confident there were no other casualties. The base was put on lockdown after the shooting but the lockdown was lifted early Friday. During the lockdown, residents were warned over a loudspeaker to stay inside.

The shooting is the second tragedy the Marine Corps has faced this week. Seven members of the 2nd Marine Expeditionary Force were killed Monday when a mortar shell exploded in its firing tube during an exercise at Hawthorne Army Depot in Nevada. Eight others were injured.