OSCEOLA, Wis. (AP) – A young girl who was participating in a snowmobile safety class was killed when her machine accelerated and crashed in western Wisconsin.  Police in Osceola say the 13-year-old girl was taking a class being taught by volunteers from the local snowmobile club on Saturday when her snowmobile suddenly accelerated and hit a loading dock. She was rushed to Osceola Medical Center, then airlifted to Regions Hospital in the Twin Cities and transferred to Gillette Children’s Hospital.  KARE-TV (http://kare11.tv/1ajTtYg ) reports the girl died on Sunday. Police say the young teen was wearing a helmet. The cause of the acceleration is being investigated by police and the Wisconsin Department of Natural Resources.