Nancy Guthrie's suspected burial site in northern Mexico was found empty this week after an anonymous tip led volunteer searchers to a mass grave near the US border, while the FBI and Pima County Sheriff admitted they have had no direct contact with Mexican authorities about the claim.
The 84-year-old Nancy, mother of TODAY show host Savannah Guthrie, has been missing for more than four months. US authorities say she was abducted from her Tucson, Arizona, home on 1 February, a day after she was last seen being dropped off after a family dinner. No suspect has been identified, no arrests have been made and, despite national attention, there has been little public sign of a breakthrough.
