SIOUX FALLS, S.D. (KELO) -- The investigation of a Sioux Falls kidnapping has resulted in a fifth arrest. 43-year-old Kathryn Ahnberg is charged with kidnapping and several counts of assault, in connection with a September crime. 2 teachers lose licenses, 2 others reprimanded Ahnberg and four others are accused of refusing to let a woman leave a central Sioux Falls home, assaulting her and then leaving her outside in rural Minnehaha County. Court documents say the victim was tied to a post with a phone cord at Clear Lake. She waited for a short time after the car left, freed herself and ran for help.Ahnberg made her first court appearance this morning.