The 'Today' show host's mother, Nancy Guthrie, 84, was taken against her will from her home on Jan. 31, police said

Authorities are "inspecting" the message for its authenticity.

Authorities are reviewing a newly received message in the ongoing investigation into Nancy Guthrie's disappearance, with the FBI urging anyone with tips to come forward.

The circumstances of the suspected kidnapping of Savannah Guthrie's mom, Nancy, are rare – and pose unique challenges, ex-FBI agents say.

The 84-year-old is the mum of Today show host Savannah Guthrie, who released a video with her siblings on Wednesday (4 February) pleading for her safe return. The FBI has now issued an update following a ‘new message’ being sent regarding Nancy’s disappearance.

No suspect has been identified during the investigation into Guthrie's disappearance, as the search for the 84-year-old continues.

If one of these impersonation attacks comes at you by way of a phone call, the FBI says, “be wary of unsolicited calls or messages. Never give personal info or money to strangers,” and critically, “hang up if something feels off.”

Sources told The Times the ransom note felt credible because it included details about a specific damaged piece of property and the placement of an accessory in the home. The Times has not reviewed the note,