(TUCSON, Ariz) -- Three-and-a-half weeks after Nancy Guthrie's abduction, the FBI is reducing its number of personnel in Tucson and relocating its command post to Phoenix, where it has its largest office in Arizona, sources briefed on the investigation told ABC News.
The shift is neither an indication the case is over nor indication investigators are giving up in the search for the 84-year-old, who was abducted from her Tucson home by an unknown suspect in the early hours of Sunday, Feb. 1, the sources said.
Instead, much of the case is now analytical: perusing Walmart sales receipts and security footage, untangling the mixed sample of DNA found inside the house, and parsing the roughly 1,500 tips that have come in since Nancy Guthrie's daughter, "Today" show host Savannah Guthrie, offered up a $1 million reward on Tuesday.
ABC News' Alex Stone and Trevor Ault contributed to this report.
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