Washington (CNN) -- The FBI on Monday announced a reward of up to $20,000 for information leading to the arrest and conviction of those responsible for firing shots at five military-related buildings in northern Virginia.
The five shootings occurred during the overnight hours in October and November, authorities said -- twice at the National Museum of the Marine Corps and once each at the Pentagon, a U.S. Marine Corps recruiting facility, and a U.S. Coast Guard recruiting facility. Ballistics testing has shown the same weapon fired shots in each instance.
No one has been injured in any of the incidents.
"Investigators believe the shooter(s) may have engaged in behaviors that the public may have observed," the FBI said in a statement. The person would have been out in the overnight or early morning hours and may have had to explain their absence from home or work, for instance. The suspect is believed to have a familiarity with northern Virginia from living or working there.
In addition, the shooter(s) "may have experienced a significant personal crisis within the past several months, such as the loss of job, divorce or financial hardship," the FBI said.
The shootings occurred during the overnight and early morning hours of October 16 to 17; October 19; October 25 to 26; October 28 to 29; and November 1 to 2, authorities said.
"We are following every lead that comes in and continue to call for the assistance of the public in helping us identify the person or persons responsible," said John G. Perren, acting assistant director in charge of the FBI's Washington field office, in the statement. "We are confident that someone out there has additional information that will be helpful to this investigation."
Anyone wishing to offer information can contact the FBI's Washington field office, the statement said.