Police investigating the disappearance of Nancy Guthrie are looking into another ransom note.

Two letters sent in relation to the vanishing of Savannah Guthrie's elderly mother in Arizona in February were made public for the first time in August and now officials at the Pima County Sheriff's Department have confirmed they are looking into a third.

In a statement, the force explained: "The PCSD/FBI Guthrie Task Force was 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."

No further details about the note or its contents have been revealed.

Chris Nanos of the Pima County Sheriff's Department (PCSD) previously explained the two other notes were made public in the hope they would provide a much-needed lead in the case as by jogging someone's memory.

In a video posted on X, Nanos explained: "We just saw what was being said, and we felt like we needed to put something out that's really accurate, and this was the time.

"Investigators felt like there's a number of pieces of information in these notes that it just might jog someone to say: 'I've heard that', or [recognize] the wording, the style of the writing. It might jog somebody to think about who would've written this, how was this done?"

He added: "My investigators, we look at it, and clearly there's things in there that are very concerning to our investigative team. So we hope that by releasing the actual note we'll get some response from the community."

The first note was sent to KOLD-TV 13 News, a local CBS affiliate on 2 February, the day after Nancy was reported missing, and addressed to Today show presenter Savannah.

It read: "We have your mother, Nancy. She is safe but scared. She will be held for ransom, and once payment is received, she will be released unharmed.

"We will be holding her for a maximum of 7 days."

The broadcaster was asked to send "Bitcoin in the amount of $4 million USD before 5 p.m. on Thursday."

The alleged kidnappers warned Savannah her mother would be "killed" of the payment wasn't received.

The second note, addressed to the Guthrie Family, was sent to KOLD on 6 February and claimed Nancy had died.

It read: "We did not fully grasp the seriousness of her physical condition. We never intended to hurt her, that was not our intention.

"She perished shortly after she was taken. We believe it was heart-related. She is buried in nature now.

"Nothing you could have done could have changed the outcome. We want your family to know this and hope you all can find peace. We are truly sorry."