Savannah Guthrie's brother urges contact in Nancy's possible abduction.

Camron Guthrie asked whoever may be holding his mother, Nancy Guthrie, to contact the family; authorities say they are treating her disappearance as a criminal matter and have not identified a suspect.

Camron Guthrie, the brother of television co-host Savannah Guthrie, released a video appeal asking whoever may be holding their mother, 84-year-old Nancy Guthrie, to make contact with the family. Nancy was reported missing from her Tucson, Arizona, home after she was not found at home following a morning when she missed church. Authorities say they are treating the case as a criminal matter and the FBI is involved. Known developments: - Camron Guthrie posted a video asking for a way to communicate and for confirmation that the family’s mother is alive; the video was shared on Savannah Guthrie’s Instagram account and was released around 5 p.m. local time, which coincided with the first deadline noted in a ransom note reported by authorities. - Investigators reported that a doorbell camera went offline early Sunday and that Nancy Guthrie’s pacemaker disconnected from its phone app; officials have not recovered clear footage of a person from nearby cameras. - Blood found outside the home has been confirmed as belonging to Nancy Guthrie, and investigators are awaiting results from additional samples. - The sheriff’s office says no suspect or person of interest has been identified and the FBI announced a $50,000 reward for information leading to Nancy Guthrie’s recovery or the arrest and conviction of those involved. Summary: Officials describe the disappearance as an active criminal investigation with family members publicly appealing for contact and confirmation of Nancy Guthrie’s welfare. Investigators have reported several technical and physical clues and are awaiting laboratory results; no suspect has been named and the next investigative steps include continued evidence analysis and efforts to establish communication. Undetermined at this time.