NBC, msnbc.com and news services
updated 10/28/2010 7:10:17 PM ET 2010-10-28T23:10:17

The same gun was used to shoot at the Pentagon, a Marine Corps museum and a vacant Marine recruiting station in northern Virginia, the FBI said Thursday.

Evidence from the FBI laboratory in Quantico, Va., links all three after-hours shootings, the agency said.

No one was injured in any of the incidents, which all involved shots fired into vacant parts of the buildings. Investigators haven't determined a motive or identified a suspect.

Shots were fired at the National Museum of the Marine Corps on Oct. 17. Two days later, bullet holes were found in the Pentagon.

Shots were also fired at a Marine Corps recruiting station in Chantilly, Va., late Monday night or early Tuesday.

The Associated Press contributed to this story.

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