'Today' show host Savannah Guthrie's mother Nancy has gone missing. Here's what we know.

Savannah Guthrie and mom Nancy.

Nathan Congleton / NBCU Photo Bank / NBCUniversal / Getty

• Savannah Guthrie's mother, Nancy Guthrie, has been missing since Sunday.
• Authorities said they believe the 84-year-old was taken against her will.
• The sheriff's office said detectives are working with the family to identify cameras outside Guthrie's home.

Nancy Guthrie, 84, the mother of "Today" show host Savannah Guthrie, has been missing since Sunday, and authorities in Tucson...