The race against time intensifies for missing 84-year-old Nancy Guthrie as investigators rush DNA processing while she remains without vital medication.

By Jana Winter WASHINGTON, Feb 12 (Reuters) - An Arizona sheriff is blocking FBI access to key evidence in the investigation into the abduction of U.S. television journalist Savannah Guthrie's mother,

Sheriff Chris Nanos clarified that his department has consistently sent evidence to a Florida lab and dismissed claims of sidelining FBI and their resources.

Pima County Sheriff Chris Nanos said the Guthrie family, including spouses and siblings, have all been ruled out as suspects in the disappearance of Nancy Guthrie. Nanos hit back at criticism of his handling of the search for Nancy Guthrie,

Pima County Sheriff Chris Nanos strongly denied reports that he was blocking the FBI from accessing evidence in the Nancy Guthrie case, calling such claims "completely false" and "furthest from the