India, Sept. 30 -- Nancy Guthrie Case Live Update: The Nancy Guthrie investigation has entered another uncertain phase after authorities received a new message claiming to be connected to the 84-year-old's disappearance. The message surfaced Monday, nearly eight months after Guthrie vanished from her home near Tucson, Arizona, but investigators quickly reviewed it and determined that it was not credible.

The Pima County Sheriff's Department (PCSD) said its investigators and the FBI Guthrie Task Force became aware of the possible ransom message and examined the information. Authorities have not disclosed where the message originated, who received it or what it contained.

The latest development comes as investigators continue to treat Gut...