State police at the Fern Ridge barracks are investigating a criminal mischief incident that happened between 4 p.m. Dec. 25 and 11:30 a.m. Dec. 26 in Chestnuthill Township.

Police said someone damaged a driver's side rear window on a 1994 Jeep Cherokee that had been parked at 6691 Hillside Drive in the township. The owner was not identified by police.