Oklahoma authorities are treating the search for 4-year-old Athena Brownfield as a "recovery operation" after her 5-year-old sister was found wandering alone outside the home of the couple caring for them. The OSBI is offering a $5,000 reward for information leading to the arrest and conviction of the person or persons responsible for Athena’s disappearance. The investigation is ongoing and anyone with information is asked to contact the OSBI tip line.