TUCSON, Ariz. (RTW News) — Authorities are intensifying the search for Nancy Guthrie, the 84-year-old mother of 'Today' show host Savannah Guthrie, who has been missing for over a week. Investigators returned to her Arizona neighborhood multiple times over the weekend, following a series of ransom notes demanding money for her release.

The situation has captured national attention, with Savannah expressing her desperation in a heartfelt video plea, urging the unknown abductors to return her mother. We beg you now to return our mother to us so that we can celebrate with her, Savannah said, emphasizing the family's devotion and willingness to pay for her safe return.

As the investigation persists, officials have yet to identify any suspects associated with the case. The Pima County Sheriff’s Department confirmed they were following up on multiple leads but had no conclusive evidence to outline the circumstances surrounding Nancy's disappearance.

Neighbors in the area have shown support, gathering outside Nancy’s home as law enforcement maintains a presence. Concerns for her health are mounting since she is reported to require daily medication, with conditions related to heart issues.

The last confirmed sighting of Nancy Guthrie was January 31, with her family alerting the authorities after she missed her church service the following day. Investigators are taking the ransom letters seriously, although they have not confirmed their authenticity.

The family hopes for a swift resolution to this distressing situation, appealing to the public for any information that may help locate Nancy.