(Slippery Rock Twp.)  State Police in New Castle are reporting an accident that involved an unknown vehicle in Slippery Rock Township. The vehicle struck and destroyed a mailbox in the area of 4132 Ellwood Road(PA-65) and fled the scene. The suspected vehicle is a 2010-2017 GMC Terrain SUV of an unknown color. Anyone with information on this hit and run incident is asked to call 724-591-2211.