TUCSON, Ariz. — Nancy Guthrie, the mother of 'Today' show anchor Savannah Guthrie, has been reported missing for four days after last being seen at her home in southern Arizona on Saturday night. Authorities found evidence of forced entry, indicating she may have been taken against her will. Sheriff Chris Nanos has confirmed that Nancy, who has limited mobility and needs daily medication, is not believed to have left voluntarily. The investigation has turned up ransom notes and detectives are following several leads, including reviewing surveillance footage and examining local cellphone tower data. Savannah has stepped back from her duties at 'Today' to focus on her family during this challenging time.