An Ankeny couple is behind bars accused of abusing their children. The Des Moines Register first reported the arrests of John and Joyce Bell Thursday after they were taken to the Polk County Jail. The pair are accused of abusing their children, including an autistic boy, over a period of years that has resulted in 68 police reports of abuse. Crystal Bell, the couple’s 21-year-old adopted daughter, has been working with authorities to document the abuse. Police have charged the couple with child endangerment causing injury.