India, Feb. 10 -- Nancy Guthrie, mother of Today show co-host Savannah Guthrie, has been missing since January 31. The 84-year-old woman is believed to have been kidnapped for ransom from her Arizona home more than a week ago. Nine days into a round-the-clock search, investigators have not identified any suspect or person of interest, and no proof of life has surfaced since her disappearance.

At least two ransom notes have come under scrutiny by police and the FBI. In the second note, alleged kidnappers demanded $6 million, setting a deadline of 5 p.m. Monday, which has since passed.

Some social media posts claimed that Savannah's brother-in-law, Tommaso Cioni, and sister Annie received the ransom notes.

Both notes were initially deliv...