The FBI said this is the third shooting at a military facility in the D.C. area in the past 10 days.
Ballistics testing determined that the shots came from the same weapon. In all three cases, shots were fired into vacant parts of the buildings, and no one was injured.
Property damage at the recruiting office at 13881 Metro Tech Drive was reported at about 8:30 a.m. Tuesday when an employee discovered two bullet holes in a window.
Several glass panels at the Marine Corps Museum in Triangle, Va., were discovered to have been struck the morning of Oct. 17, but none of the museum's artifacts was affected.
Then just before 5 a.m. on Oct. 19, officers at the Pentagon reported hearing shots in the area of the south parking lot. Fragments of two bullets were found embedded in windows on the third and fourth floors. They shattered but didn't penetrate the reinforced-glass windows, which were part of unoccupied offices. Four other bullets struck the Pentagon's façade.
In the wake of the shootings, security is being stepped up for Sunday’s Marine Corps Marathon. The Pentagon was the most prominent target, and more than 30,000 marathon runners will be speeding right by the Defense Department headquarters on Sunday.
The Pentagon Force Protection Agency said it will provide tighter security, particularly near the pre-race staging area on the Pentagon’s north parking lot, though officials insist there is no known threat for the marathon.
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