Savannah Guthrie asks for proof of life as her mother remains missing.

Savannah Guthrie posted a tearful Instagram video asking for proof that her mother, Nancy Guthrie, is alive. Officials say Nancy has been missing since Sunday and investigators believe she was taken from her home.

Savannah Guthrie posted a short, emotional video on Instagram asking anyone with information to provide proof that her mother, Nancy Guthrie, is alive. She appeared with her siblings and said the family is ready to listen and speak with anyone who has information. Guthrie said her mother needs medication. Officials told NBC Nightly News they believe Nancy was taken from her home against her will and that she has been missing since Sunday. Key facts: - Savannah Guthrie publicly appealed for proof of life and asked potential captors to reach out. - Nancy Guthrie has been reported missing since Sunday and officials said she may have been taken from her home against her will. - Guthrie told viewers her mother requires medication to survive. - The sheriff's office told Business Insider the home was equipped with multiple cameras and detectives are reviewing available footage. Summary: The family has made a public plea while investigators examine home camera footage to determine what is available. Further developments will depend on the outcome of that review and any direct contact with the family.