Authorities say a San Francisco Bay Area police sergeant was shot and killed during an early-morning traffic stop. Hayward Police Wednesday morning identified the officer as Sgt. Scott Lunger. Lunger was shot about 3:15 a.m. after he stopped a white Chevrolet pickup that was swerving on the road. […] Police later discovered a truck in Oakland with bullet holes. It matches a description of the truck involved in the incident. It was not clear if the driver has been arrested. …