State police investigated a school bus crash Friday at 3:50 p.m. on state route 417 in the town of Andover. The bus driver, identified as Stephen C. Lewis, 67, of Andover, was flown from the scene by LifeNet helicopter to Strong Memorial in Rochester. The extent of his injuries were not reported. There were no students on the bus at the time of the crash. The bus reportedly veered off the road, striking guard rails. No other vehicles were involved. Andover fire, EMS and medic 700 all responded to the scene.