The mother of Savannah Guthrie has been reported missing in Arizona under what authorities described as “concerning circumstances.”

Nancy Guthrie, 84, was last seen around 9:30 p.m. Saturday at her home in Catalina Foothills, a community north of Tucson, according to the Pima County Sheriff’s Office, per the New York Post.

Officials said Guthrie is “not in good physical health” and was classified as a “vulnerable adult.” A relative placed a 911 call around noon Sunday to report her missing, Sheriff Chris Nanos said during a press conference.

Authorities later confirmed that Nancy Guthrie is the mother of Savannah Guthrie, who has served as a co-anchor of NBC’s Today since 2012, according to ABC15 Arizona.

The case is being treated as a large-scale search and rescue mission. Homicide detectives were also seen processing the elderly woman’s home — a step officials said is not standard protocol in typical missing-person cases.