(Hillsboro, OR)  --  An investigation is ongoing into a crash that seriously injured a bicyclist in Hillsboro.  Police say the crash happened last night at Northeast Cornell Road and 28th Avenue.  Police say the driver struck a 53-year-old bicyclist while turning onto Cornell and then left the scene.  The driver then returned to the scene and is cooperating with investigators.  The bicyclist was airlifted to a hospital with serious injuries.