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Since the note was first sent to news outlets last week, the sender has not contacted law enforcement or the Guthrie family. Investigators are still trying to determine whether the notes are genuine.
“Detectives and agents continue to conduct follow-up at multiple locations. Details of that follow-up are not being released at this time,” the Pima County, Ariz., Sheriff’s Department noted on Sunday.
It’s now been eight days since Nancy disappeared. A new payment deadline, per a ransom note, is approaching later on Monday.