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 ...

In this May 4, 2015, file photo, Australian-born presenter, Savannah Guthrie poses alongside her mother Nancy Guthrie during a production break while hosting NBC’s ‘Today Show’ live from Australia at Sydney Opera House in Sydney. (Don Arnold ...

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 ...

The FBI has received DNA evidence recovered from the Tucson, Arizona, home of Nancy Guthrie, including test results from a hair sample, sources familiar with the investigation told Fox News Digital. A source with knowledge of the investigation confirmed ...

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

On this Mother's Day, Today show co-host Savannah Guthrie is again asking for the public's help to find her mother, Nancy. Nancy Guthrie went missing from her Tucson-area home on February 1.

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 ...