By Matt Apuzzo
WASHINGTON — As authorities investigated a fourth nighttime shooting at a Washington-area military building, the FBI urged the unknown gunman to surrender before someone is hurt.
"We appreciate that he is struggling right now," FBI spokeswoman Katherine Schweit said Friday. "This guy hasn't hurt anybody. We don't think he wants to. We're hoping that he'll turn himself in."
Police in Virginia are investigating an overnight shooting at the National Museum of the Marine Corps, the fourth such shooting at military-related buildings in the area.
FBI Assistant Director John Perren said the shooting bears the hallmarks of shootings at the Pentagon, a Marine Corps museum and a military recruiting center, but said authorities need to conduct forensic tests to see if they are connected.
The FBI laboratory in Quantico, Va., has previously linked the first three after-hours shootings.
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.
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Investigators haven't determined a motive or identified a suspect.