Kentucky State Police served a search warrant Friday at Hodgenville City Hall.
Hodgenville Mayor Terry Cruse notified The LaRue County Herald News about 10 a.m. that City Hall would be closed while the investigation takes place.
A trooper turned away residents from the door, informing them City Hall would reopen later that day.
Investigators left about 2:30 p.m., according to City Clerk MaDonna Hornback.
Mayor Cruse said his staff was "fully cooperative" with the investigators.
"With everything that has happened, I got the advice of our attorney," he said. "Basically I don't need to comment at this time. I think we've done the city a good job and I know where most of this has come from."
No further information is available.