UNDATED (KDAL) - The St. Louis County Sheriff's Office is investigating three separate snowmobile accidents over the weekend that injured the operators. On Saturday a snowmobile driven by an Iron, Minnesota man hit a rock in the ditch of the Campground Road near Highway 169 in Mt. Iron. The snowmobile flipped over and landed on the driver who was taken to the hospital in Virginia with non life threatening injuries. An accident on Crane Lake early Sunday morning sent a Ramsey, Minnesota man to the Cook Hospital after his snowmobile struck a large snowbank off an ice road. Later on Sunday a Duluth man was hospitalized after the snowmobile he was driving on Caribou Lake went out of control and rolled over.