UPDATE: Police in Virginia say bullet holes were found at the National Museum of the Marine Corps. It's the fourth time someone has fired at military-related buildings in the area since Oct. 17.
The FBI is urging the gunman behind the shootings to turn himself in. They say the latest shooting at the marine corps museum in Triangle, Va., appears to be connected to the earlier three shootings, but forensic testing is still needed. Prince William County Police and the FBI are still at the museum gathering evidence.
No one was injured and the police say the shots were fired overnight when no one was in the building. Police are turning away visitors and there seems to be more visitors than usual, many from outside the area, because many people are arriving to the D.C. area for this weekend's Marine Corps Marathon.
A few would-be visitors, who are also running in the marathon, say they are concerned that three different military facilities in the area have been targets of gunfire, but they don't think it will change the atmosphere for the marathon this weekend.
ORIGINAL POST: The FBI says it can link this week's shooting at a vacant Marine recruiting station in Chantilly, Va., to earlier shootings at the Pentagon and the Marine Corps Museum in Northern Virginia.
Investigators say evidence from the FBI laboratory in Quantico, Va., shows the same gun was used in all three shootings. Among other similarities, all three involved shots were fired into vacant parts of military-related buildings during late night or early morning hours. No one was injured in any of the incidents.
Shots on the National Museum of the Marine Corps came first on Oct. 17. Two days later bullet holes were found in the Pentagon. Shots were fired at the recruiting station in Chantilly late Monday night or early Tuesday.
Investigators say they haven't determined a motive or identified a suspect.
Video of FBI press conference Friday morning from NBC4:
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