It’s been a week since “Today” show host Savannah Guthrie’s mother disappeared from her home in Arizona in what authorities say was a kidnapping. Investigators have been examining ransom notes and looking for evidence but have not named a suspect. On Friday, officers returned to 84-year-old Nancy Guthrie’s home near Tucson and to the surrounding neighborhood to continue their search. Family members told officials they last saw Nancy Guthrie at 9:48 p.m. on Jan. 31 when they dropped her off at home after they ate dinner and played games together. The next day, family learned she didn’t attend church. They reported her missing after they checked on her.