India, Oct. 4 -- Nancy Guthrie Case Latest Update Today: The FBI is reducing the number of personnel working from Tucson and relocating its command post to Phoenix as the investigation into the disappearance of 84-year-old Nancy Guthrie continues, according to sources briefed on the investigation who spoke to ABC News.

The change comes about three-and-a-half weeks after Guthrie was abducted from her Tucson home in the early hours of Sunday, February 1. Investigators stressed that the move does not mean the case is over or that authorities are abandoning the search for Guthrie.

Nancy Guthrie Case: FBI Moves Command Post From Tucson To Phoenix

According to ABC News, the FBI will continue to have agents in Tucson and work with the Pima Co...