TUCSON, Ariz. — Investigators are reviewing a possible new ransom note in the disappearance of Nancy Guthrie, the mother of "Today" show co-anchor Savannah Guthrie, nearly eight months after she vanished from her home near Tucson, authorities said Monday.

The Pima County Sheriff's Department and the FBI Guthrie Task Force said in a statement that they were "recently made aware of a new possible ransom note related to the Nancy Guthrie investigation."

"Investigators are also aware of social media comments regarding the note and are looking further into the information to determine its credibility," the agencies said.

Authorities did not say how the note surfaced, who received it or what it said. The statement did not include the text of the note.

The announcement came after a woman named Lauren Serpa, who has said she knew Guthrie, wrote in a Facebook post that she had received a ransom demand on Sunday night, according to Newsweek.

Serpa said earlier this year that she was not a close friend of Guthrie's but that Guthrie had shown her kindness at a farmers market nearly 12 years ago, after Serpa's husband died of a brain aneurysm.

Authorities have not said whether the note under review is the one Serpa described, and they have not confirmed whether it is connected to Guthrie's disappearance.

Disappearance and investigation

Guthrie, 84, was last seen at her home outside Tucson on the night of Jan. 31 and was reported missing the next day,........

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