The same weapon was used in four recent shootings at D.C.-area military facilities, said 1st Sgt. Kim Chinn, spokeswoman for the Prince William County police.
Ballistics testing has linked a Friday shooting at the National Museum of the Marine Corps to three other incidents — one at the Pentagon, one at a Chantilly Marine Corps recruiting center and a previous shooting at the museum. Authorities had previously linked the first three shootings.
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