A strand of DNA recovered from Nancy Guthrie’s Arizona home is undergoing extensive testing at the FBI’s crime lab as the investigation hit the 100-day mark — and authorities continue to hold out hope for a break in the case.

The 84-year-old mother of "Today" host Savannah Guthrie is believed to have been taken against her will from her Tucson, Ariz., home in the early morning hours of Feb. 1 Don Arnold/WireImage; FBI Phoenix/X Federal investigators are using new technology to ...

Add Yahoo as a preferred source to see more of our stories on Google. The FBI recently received and is now analyzing potentially critical DNA recovered from the Tucson, Arizona, home of Nancy Guthrie, sources familiar with the investigation told ABC News.

A top FBI official is clarifying reports regarding critical new DNA information being found at Nancy Guthrie's home in Tuscon, Ariz. "This is not new evidence or information. FBI asked to test this DNA 2 months ago with the same technology we’ve always ...

Today host Savannah Guthrie's missing mom, Nancy Guthrie, was 'alive' when taken from her home according to a retired FBI profier weighing in on the case

Mother’s Day plea: Neighbors left flowers and signs outside Nancy Guthrie’s home, appealing directly to her abductor to let her go or reveal her location. DNA investigation: FBI is analyzing hair evidence from Nancy’s home using advanced technology ...

The search for "Today" show host Savannah Guthrie's 84-year-old mom Nancy Guthrie has had a few breakthroughs, and some dead ends.

Attorney General Todd Blanche shut down reports of 'friction' between the FBI and local authorities handling the Nancy Guthrie case.