(Portland, OR)  --  An investigation is ongoing into an officer-involved shooting in St. Johns.  The Portland Police Bureau says officers were responding to a report of gunfire early yesterday morning when the incident happened.  Police say an officer contacted the suspect but he got into a truck and tried to run over the officer, who fired at the vehicle.  The truck hit a patrol car and fled.  Police lost the vehicle in the neighborhood.  It's unknown whether the driver was injured by the shooting.