Donald Trump has vowed to help, saying he was directing federal and local law enforcement to assist the family.
host Savannah Guthrie has pleaded for the return of her mother and said the family is «ready to talk» to her captor — but asked them to provide proof she is alive.
In an emotional video message posted on social media, the NBC anchor, flanked by her siblings, said: «We are ready to talk. However, we live in a world where voices and images are easily manipulated.
«We need to know without a doubt that she is alive and that you have her. We want to hear from you, and we are ready to listen. Please reach out to us.»
Nancy Guthrie was last seen at her home near Tucson, Arizona, on Saturday evening. The 84-year-old was reported missing the following day after she failed to appear at church.
Investigators said they had found signs of forced entry at her home and believe she was taken against her will.
Several media organisations reported receiving apparent ransom notes earlier this week that they handed over to police.
