A pickup truck plunged into the Schuylkill river near Port Clinton in Schuylkill County on Sunday afternoon and the driver and any occupants have not yet been found. State police at Schuylkill Haven said the incident occurred about 12:29 p.m. along SR61 across from the entrance to the Weiser State Park, and three-tenths of a mile north of the 3Cs Restaurant in West Brunswick Township.