It's been more than two weeks since the 84-year-old mother of NBC News anchor Savannah Guthrie disappeared in the middle of the night from her home in Tucson, Arizona.

Authorities believe Nancy Guthrie was taken against her will and there are concerns for her health as she requires daily medication.

Savannah Guthrie and her siblings have made several public pleas asking for the safe return of their Mother.

• Guest: Darren Mott, former FBI special agent
• Producer: Brooke Young, Pip Cook