India, Feb. 7 -- Nancy Guthrie, the mother of Today show host Savannah Guthrie, was abducted earlier this week, authorities in Arizona confirmed.

Five days into the search for the 84-year-old, Pima County Sheriff Chris Nanos said Thursday that investigators have not identified any suspects or persons of interest.

Authorities believe Nancy Guthrie was taken against her will from her home in Tucson, Arizona, over the weekend. DNA testing confirmed that blood found on her front porch matched her DNA.

At least three media organizations reported receiving what appeared to be ransom notes related to the case and turned them over to investigators. Sheriff Nanos said one ransom note was determined to be fake, leading to an arrest. Officials ha...