(Preble County, OH)--Traffic on I-70 was backed up most of Monday afternoon and into Monday night as the result of a semi fire in Preble County.  It started in the westbound lanes near the State Route 503 exit at 3 o’clock Monday afternoon.  Westbound 70 was completely shut down and crews unloaded the semi and put the fire out.  The Ohio Highway Patrol said the closure caused a ten-mile backup.  The interstate didn’t complete reopen until about 9 o’clock Monday night.  The semi driver suffered minor injuries.