Emailer in Nancy Guthrie case claims to possess video of 'main guy' with Savannah Guthrie's mother

A person purporting to have direct knowledge of Nancy Guthrie's abduction is now also claiming to have video evidence and that there were two kidnappers directly involved, according to TMZ founder Harvey Levin, who received the message.

Levin revealed the latest email in a series of messages he said he's received since the early days of the case, from someone claiming to know what happened to the 84-year-old mother of "Today" co-host Savannah Guthrie.

Authorities have not publicly confirmed the legitimacy of the first two notes that have been deemed possibly authentic — or the TMZ emails, and sources close to the investigation appear split.

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WATCH: Tipster claiming inside knowledge of Guthrie kidnapping says there were 2 kidnappers

Some investigators believe that the ransom demands are all bogus, while others are cautious about reaching that conclusion while Guthrie's whereabouts remain unknown, sources tell Fox News and Fox News Digital.

"I have a phone stashed in a secure location guaranteeing both the information it stores and the safety of the phone," the sender wrote, according to Levin. "What it contains is my definition of delivering them on a silver platter, a short video of the main guy with Nancy the day that was probably her last, pictures of both involved, names and addresses and age."

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In a video posted to X Friday, Levin challenged the sender to prove it.

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"If you've got something, send it," he said, urging the sender to prove he or she isn't a fraudster.

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The emailer has sought various sums of up to $100,000 for the information they claim to be able to provide and is now asking for a single Bitcoin, worth about $60,000 Friday afternoon.

Meanwhile, there is more than $1 million available from Guthrie's daughter, "Today" co-host Savannah Guthrie, for her mother's return. And 88-Crime, Tucson's Crime Stoppers affiliate, is offering $102,500 for information leading to an arrest in the case, which can be claimed anonymously.

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Levin said he sent the email to the FBI, which did not immediately respond to requests for comment.

TMZ claims to have authenticated the email, with Levin explaining that the message included a Bitcoin account that had not been publicly revealed but had been included in earlier messages.

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The sender also appears to be following news updates on the case — questioning recent reports that he or she may be a female and reacting to viral reports about a false alarm last week.

"I am not the idiot who recently called in a tip about her burial site in Mexico," the sender allegedly wrote.

Anyone with information on Guthrie's case is asked to dial 1-800-CALL-FBI. There is a combined reward of more than $1.2 million for information that cracks the case.

Tips can be provided anonymously to Tucson's Crime Stoppers affiliate, 88-Crime, at 1-520-882-7463.