The FBI announced in Washington, D.C. today that it has opened an investigation into three shootings that have occurred in Northern Virginia since Oct. 17, 2010. Investigative evidence has confirmed that shots fired at the National Museum of the Marine Corps in Triangle, Va., and the Pentagon in Arlington, involved a single weapon. Ballistics testing is underway for an overnight shooting that took place on Oct. 25 or Oct. 26 at the Marine Corps Recruiting Station in Chantilly. The incident at the National Museum of the Marine Corps took place during the early morning hours on Oct. 17, 2010. A similar incident occurred at approximately 5 a.m. on Oct. 19, 2010, at the Pentagon after officers reported audible shots fired in the vicinity of the Pentagon’s south parking lot, which faces I-395.