India, June 12 -- A volunteer search group, Buscando Corazones Nogales, in northern Mexico, conducted a large-scale search for Nancy Guthrie after receiving an anonymous tip, per Mexican newspaper El Imparcial.

According to the head of the group, Ramona Guadalupe Ayala Ortiz, who spoke to El Imparcial, the tip claimed that the Tucson grandmother had been buried in an unmarked grave near the US-Mexico border.

The search did not uncover any remains linked to Guthrie, but organizers say they will continue searching the area and investigating the information they received.

Nancy, the mother of NBC host Savannah Guthrie, disappeared from her home in the Catalina Foothills area near Tucson, Arizona, during the early hours of February 1. Auth...