Nancy Guthrie, the 84-year-old mother of Savannah Guthrie, was last seen by her family on Jan. 31.

Law enforcement officials in Arizona said Wednesday they have not identified a suspect as they enter the fourth day searching for Nancy Guthrie.

The 84 year-old mother of Savannah Guthrie, the popular co-host of the NBC news show Today, was last seen at her Arizona home on Saturday night.