TUCSON, Ariz. — Federal authorities have acknowledged a potential misstep in their handling of a cryptocurrency ransom demand connected to the disappearance of Nancy Guthrie, a Tucson woman who vanished from her home earlier this year. The admission highlights challenges in investigating cases involving digital currencies and cross-border elements as search efforts continue along the U.S.-Mexico border.

The FBI, collaborating with the Pima County Sheriff's Department, received a reported demand for $4 million in Bitcoin from individuals claiming responsibility for Guthrie's abduction. Task force insiders indicated that only a small amount — approximately $152 — was transferred as part of a strategy designed to prompt further communication from the suspects. The limited payment, intended to test the legitimacy of the demand, instead resulted in a complete cessation of contact.

This tactic, sometimes referred to in law enforcement circles as an attempt to "tickle the wire," aimed to elicit responses that could provide additional investigative leads. However, the lack of follow-up communication has prompted internal reviews of the approach and its effectiveness in digital ransom situations. Authorities have described the outcome as potentially complicating the case, though they continue pursuing multiple avenues.

Guthrie, the mother of NBC News correspondent Savannah Guthrie, disappeared from her Tucson residence. The case quickly drew national attention due to the family's public profile and the mysterious circumstances surrounding her vanishing. Investigators initially treated it as a missing persons matter before shifting focus based on emerging evidence suggesting possible abduction.

Search operations have expanded into regions south of the Arizona border following anonymous tips. A Mexican volunteer organization, Buscando Corazones Nogales, recently examined areas near........

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