Authorities investigating the disappearance of Nancy Guthrie, the mother of US TV host Savannah Guthrie, are examining a possible new ransom note.
The 84-year-old vanished from her home outside Tucson in Arizona on 1 February.
In a statement, Pima County Sheriff's Office said both they and the FBI were made aware of a new possible ransom note related to the Nancy Guthrie investigation.
The sheriff's office said: "Investigators are also aware of social media comments regarding the note and are looking further into the information to determine its credibility."
Ms Guthrie, who had been in frail health with limited mobility, was last seen alive at her home on 31 January.
Footage later emerged that showed an armed man in a ski mask tampering with her doorbell camera shortly before her disappearance.
DNA tests also concluded that blood found on the front porch was a match for Nancy Guthrie.
Two ransom notes sent to media outlets in the immediate aftermath of her disappearance - and a third which claimed to know the kidnappers' identities - were fake, according to the FBI.
Celebrity news website TMZ received the first note, which demanded cryptocurrency worth millions of dollars.
The FBI attempted to test its authenticity by depositing a small amount of cryptocurrency in the account mentioned in the note, but it was never claimed.
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Savannah Guthrie, who co-anchors the Today programme on Sky's US partner network NBC, has led the campaign to find her mother, with the family offering a $1m (755,000) reward for information leading to her recovery.
Her disappearance almost eight months ago has drawn national and international attention.
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