The shooting at the Washington Navy Yard on Monday was among the deadliest attacks at a U.S. defence facility, with at least 13 confirmed fatalities including the shooter.
READ MORE: Dead Washington Navy Yard shooter identified as Aaron Alexis
At the time of publication, police were looking for one other possible gunman wearing a military-style uniform.
In the past 20 years, there have been a several mass killing at U.S. bases, offices or nearby locations.
Global News takes a look at some of the attacks and who perpetrated them.
Fort Hood massacre
The shooting at the Washington Navy Yard happened less than three weeks after a U.S. Army psychiatrist received the death sentence for a 2009 rampage at the Texas’ Fort Hood base that left 13 people dead.
Nidal Hasan murdered 12 soldiers and one civilian at the Soldier Readiness Processing Centre, on Nov. 5, 2009, where troops were waiting to receive routine medical check-ups.
More than 30 people were injured in the incident, including a base civilian police officer, Not all of those injured were shot — many were hurt trying to escape the shooting.
Hasan could be the first active-duty U.S. soldier put to death since 1961.
The Fort Hood massacre is considered the worst military base shooting in U.S. history.
Camp Liberty (Iraq)
A U.S. soldier killed five military personnel at Camp Liberty base, near Baghdad International Airport on May 11, 2009.
Sgt. John Russell is now serving a life sentence for shooting five service members at the Camp Liberty Combat Stress Centre.
At his trial earlier this year, experts testified Russell had brain abnormalities, but a military judge dismissed the argument as the tests were conducted almost four years after the shooting.
Although a military health board determined now 48-year-old Russell “suffered from severe depression with psychotic features and post-combat stress” at the time of the killings, military judge Col. David Conn found him guilty of premeditated murder on May 16, 2013.
Pentagon shooting
Pentagon police officers shot John Patrick Bedell before he managed to kill anyone after he opened fire with a semi-automatic weapon at a security checkpoint on March 4, 2010. He did manage to injured two Pentagon police officers before he was wounded.
Bedell began shooting at a security checkpoint at the Pentagon metro station, after officers asked to see the 36-year-old’s credentials. The shoot-out was over within one minute. Bedell died in hospital later that night.
Bedell, a computer programmer from Hollister, Calif., had a history of mental health issues and reportedly held extremist views against the government.
Little Rock Army recruiting office
Abdulhakim Mujahid Muhammad shot and killed 23-year-old Army Pvt. William A. Long and injured 18-year-old Pvt. Quinton Ezeagwula in a drive-by shooting at a Little Rock, Ark. recruiting office.
Fairchild Air Force Base
Dean Mellberg was discharged from the U.S. Air Force just weeks before he fatally shot four people at Fairchild Air Force Base hospital, in Washington state, on June 20, 1994.
The 20-year-old Air Force mechanic’s first targets were psychiatrist Maj. Thomas Brigham, whose diagnosis of Mellberg’s emotional issues factored into his dismissal, and psychologist Capt. Allan London, who shared the office with Brigham.
After Mellberg shot the men he walked through the building and parking lot firing at random, also gunning down 8-year-old Christine McCaren and 62-year-old Anita Linder.
He injured 23 others in the rampage, including two other young children, before he was shot by a military police officer.
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Luigi’s restaurant shooting
Although it didn’t happen on a military base, a 22-year-old soldier from Fort Bragg military base in North Carolina killed four people and injured eight others at a pizza restaurant in 1993.
Sgt. Kenneth Junior French shot the elderly owners of Luigi’s restaurant , in nearby Fayetteville, as well as a 26-year-old man and a 46-year-old man who was reportedly trying to protect his son.
According to a New York Times report, witnesses told police the shooter spoke about President Bill Clinton and gays in the military before opening fire inside the restaurant the evening of Aug. 6, 1993.
French reportedly said, “You think I’m not going to do this? I’ll show you about gays in the military.”
The soldier received a life sentence on four counts of first-degree murder.
*With files from The Associated Press
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