When a gunman perched atop a cliff’s ledge opened fire on a dozen cars on Kentucky’s Interstate 75, wounding five people, it permeated surrounding communities with fear – and sent one couple into the woods to join the dayslong manhunt for the assailant.

A search for Joseph Couch, the Kentucky man suspected of opening fire on vehicles on Interstate 75 and injuring five people, entered its fourth day Tuesday as officials scoured Daniel Boone National Forest using helicopters, drones and canines.