Article continues below advertisementAuthorities in Pima County, Ariz., are now treating the disappearance of Today show co-anchor Savannah Guthrie's 84-year-old mother, Nancy Guthrie, as a potential crime.Officials say "concerning" evidence was found at her home.Article continues below advertisement'We Have a Crime'Source: @savannahguthrie/InstagramSavannah Guthrie's mother's disappearance is now considered a crime.