(Hamburg, MN)  --  The Sibley County Sheriff’s Office is investigating a tractor accident that injured a man near Hamburg.  Deputies say 88-year-old Gordon Panning was trying to start the tractor from the ground Tuesday afternoon when he was run over.  Panning was airlifted to Hennepin County Medical Center for treatment.  The tractor was apparently in gear and began moving once the engine started.  No word on Panning's current condition.