The search for 84-year-old Nancy Guthrie, the mother of "Today" host Savannah Guthrie, began after she was abducted from her home near Tucson, Arizona, on Sunday, Feb. 1, authorities said.

Authorities have detained a person for questioning in connection with the disappearance of Nancy Guthrie, the Pima County Sheriff’s Department said Tuesday night.

It came a day after what appeared to be the biggest break in the case, when the authorities were able to recover footage from Ms. Guthrie’s doorbell camera that showed a masked, armed person at her do...