India, Feb. 14 -- Nancy Guthrie, the 84-year-old mother of NBC Today co-anchor Savannah Guthrie, has been missing for 13 days. She was last seen on the evening of January 31, when family members dropped her off at her home in the Catalina Foothills near Tucson.

Authorities believe the case may involve a kidnapping for ransom. Surveillance footage from that night shows an armed man attempting to tamper with a camera outside her home.

In the days that followed, multiple ransom notes were reportedly sent to media outlets. One demanded millions of dollars in cryptocurrency (Bitcoin) for her safe return, with a stated deadline of February 9. Guthrie and her two siblings indicated they were willing to pay a ransom, though there is no confirme...