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A convoy of sheriff and FBI vehicles, including forensic units, navigated through a roadblock situated roughly 3.2 kilometers from the residence in question.
The Pima County Sheriff’s Department confirmed that the operation was linked to the ongoing Guthrie case but refrained from providing further details.
Eighty-four-year-old Guthrie was officially reported missing on February 1.
Investigators revealed that traces of her blood were discovered on the front porch of her home near Tucson.
Ransom notes allegedly connected to the case were distributed to media outlets, yet the deadlines for payment have already lapsed without any resolution.
She is said to have a pacemaker and has dealt with high blood pressure and heart issues, according to sheriff’s dispatcher audio on broadcastify.com.
Investigators have studied surveillance video, sorted through thousands of tips and submitted DNA and other evidence for laboratory analysis.
The FBI said it has collected more than 13,000 tips since February 1, the day Guthrie was reported missing.
The sheriff’s department, meanwhile, said it has taken at least 18,000 calls.
On Tuesday, authorities released footage showing an armed, masked person at Guthrie’s doorstep on the night she was abducted.
The videos — less than a combined minute in length — gave investigators and the public their first glimpse of who was outside Guthrie’s home in the foothills outside Tucson.
Experts say the video could contain a mountain of clues.
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