Arlington, Va. ? FBI investigators have a simple message for the shooter who has hit the Pentagon, a Marine museum and two military recruiting stations in the Washington area: Call us.

Authorities want to talk to the person they believe may be an ex-Marine who has a gripe with the corps. The museum near the Marine Corps Base in Quantico was struck twice and one of the recruiting stations hit was a Marine outfit.

Unlike the 2002 D.C.-area snipers, this shooter doesn’t appear to want to hurt anyone, using a high-powered rifle to fire at the buildings only at night, when no one is around.

The shooter “is trying to express some unhappiness, presumably with the military, but has stopped short of harming anyone, and I draw some positive analysis out of that,” said Gary Noesner, a former chief of the FBI’s crisis negotiation unit. “Hopefully, that will remain the case.”

The FBI often publicly asks suspects to give

After they were caught, investigators revealed the snipers had made a number of hot line calls that were mishandled or misunderstood.

The first shooting was discovered Oct. 17 at National Museum of the Marine Corps in Triangle, about 30 miles south of Washington. Days later, five to seven shots were fired at the Pentagon. Then, the shooter hit a Marine Corps recruiting station in Chantilly before again firing on the Marine Corps museum.

After that shooting, authorities held a news conference suggesting the shooter may have had a beef with the Marine Corps.

On Tuesday, bullet holes were discovered at a Coast Guard recruiting station near a sprawling outlet mall in Woodbridge. Although the most recent shooting targeted the Coast Guard, FBI spokeswoman Lindsay Godwin said investigators would not make any further statement. The FBI has not elaborated on its profile of the suspect, and authorities have not said whether surveillance video is part of the investigation.

The same gun was used in all five shootings, the FBI said, and the buildings are within 40 miles of each other.