India, April 17 -- The investigation into the disappearance of Nancy Guthrie has taken a fresh turn, with the FBI now analysing potentially key DNA recovered from her Tucson home. According to sources cited by ABC News, the agency recently received evidence considered "potentially critical" to the case.

Journalist Brian Entin reported that the material includes hair samples collected from inside the residence, now sent to an FBI lab for advanced testing.

The development follows earlier forensic analysis conducted at a Florida lab used by the Pima County Sheriff's Office.

Nancy Guthrie, 84, has been missing since January 31, when she was last seen at her home in Tucson, Arizona. Authorities believe she may have been taken against her wi...