(Marissa, IL)  —  Authorities are investigating after a mother and son who went missing were found in St. Clair County.  The sheriff’s office says Sarah Donley-Fortner and her toddler son were located yesterday in Marissa after disappearing six hours earlier.  Both were transported to the hospital with minor injuries.  Detectives believe they may have been injured in a “domestic dispute” by someone the mother knew.