(Update: The FBI is urging a gunman who has fired repeatedly after hours at military buildings to surrender to authorities. FBI spokeswoman Katherine Schweit says the bureau believes the unknown shooter is hurting, but says she doesn't believe the individual wants to hurt anyone.)
Triangle, Va. (AP) - Police in Virginia say bullet holes were found at the National Museum of the Marine Corps, the fourth time someone has fired at military-related buildings in the area.
No one was hurt in any of the shootings.
First Sgt. Kim Chinn, a Prince William County police spokeswoman, says multiple shots were fired sometime after the museum closed Thursday night. The museum is in Triangle, Va., about 30 miles south of the Pentagon.
Bullet holes were first found at the museum Oct. 17. Two days later, shots were fired into two windows at the Defense Department in suburban Virginia.
A third military office -- a Marine Corps recruiting station in Chantilly, Va., outside Washington -- was shot at late Monday or early Tuesday.
The FBI says the same gun was used in the first three cases.