(Portland, OR) -- Portland's Gun Violence Reduction Team is investigating a shooting in the northeast part of the city early Saturday morning. The Portland Police Bureau says two cars were stopped at a red light on Northeast Columbia Parkway at Killingsworth Street just before 3 a.m. when two other cars pulled up to the light. Police say that's when someone in one of the cars opened fire, hitting two other vehicles. One of the drivers was grazed by a bullet. It's not yet clear what led to the shooting.