United Kingdom, Feb. 5 -- Savannah Guthrie has filmed an emotional video demanding proof her missing mother Nancy "is still alive".

The Today show presenter, 54, has been left distraught after the 84 year old vanished from her home in Arizona last week and now she has released a clip - which she filmed alongside her siblings Annie and Camron - in which she addressed potential kidnappers and urged anyone holding Nancy to "reach out to us" and provide proof of life.

In the video, Savannah, who was sat next to her brother and sister, said: "We too have heard the reports about a ransom letter in the media. As a family, we are doing everything that we can. We are ready to talk.

"However, we live in a world where voices and images are easily...