A 125-year-old stained-glass window at the Pequot Library was broken by vandals sometime over the past week.
A rock, about the size of a soda can, was thrown through the window between Aug. 21 and Wednesday, according to Martha Lord, executive director of the library, when the vandalism was reported to police.
Lord said at first they thought the window might have been broken accidentally while the library's expansive front lawn was being mowed. However, she said, it was determined the rock was too large to have been kicked up by the lawn mower.
Library officials said they don't know how much it will cost to repair the window, and they have an expert coming out to look at it Friday.