Iowa police say a Waterloo man has been arrested after a 12-year-old driving his car struck a 4-year-old boy on a bicycle, the AP reports. Police say 34-year-old Jesse Azbill had given the 12-year-old boy permission to drive the vehicle, and Azbill was in it when the little boy was struck just before 1pm Tuesday in Waterloo. The boy was taken to University of Iowa Hospitals & Clinics in Iowa City for treatment, though his name and medical condition have not been released. Jail records say Azbill remained in custody Thursday, charged with child endangerment causing injury and serious injury by vehicle. Police aren't certain of Azbill's relationship with the 12-year-old boy. (More child endangerment stories.)