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

"Nancy Guthrie, 84, the mother of beloved "Today" show host Savannah Guthrie, has been missing since Sunday, and authorities are investigating her disappearance as a crime. Pima County Sheriff Chris Nanos said that based on the scene at her Tucson, Arizona, home, he believes this is a " possible kidnapping or abduction" case. "Just call us. Let her go. Just call us. The family will tell you, there's no questions asked here," Nanos told NBC News."

"The next day, Sunday, February 1, a friend called the family concerned when Nancy wasn't present for Sunday service at her church. After an hour of searching the home and property, the family called 911. Authorities say her cell phone and car were left behind. She has limited mobility and requires daily medication that can be fatal if not received within 24 hours."

Nancy Guthrie, 84, was last seen at her home outside Tucson, Arizona, on the evening of January 31 after family members dropped her off. A friend noticed her absence from Sunday church service on February 1, prompting an hour-long search and a 911 call. Authorities report her cell phone and car were left behind; she has limited mobility and requires daily medication that can be fatal if missed for more than 24 hours. Pima County Sheriff Chris Nanos described the scene as consistent with a possible kidnapping or abduction. Investigators are searching using drones, aircraft, search-and-rescue dogs, volunteers, and are examining possible DNA evidence and electronic devices. Savannah Guthrie has not appeared on Today since her mother's disappearance.

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