India, June 15 -- Nancy Guthrie Case Latest News: The search for missing Arizona grandmother Nancy Guthrie has taken a sharp and unsettling turn after a new anonymous tip pointed investigators toward a possible mass grave site in northern Mexico. The development has intensified a case already stretched across borders, emotion and months of unanswered questions.

Nancy Guthrie Case Latest Update: New Mexico Tip Reignites Search Efforts

A volunteer search group in Mexico, Buscando Corazones, said it received an anonymous message claiming Guthrie's remains may be buried near Nogales. The alleged location lies in a remote border zone known for difficult terrain and past discoveries of unmarked graves while the tip immediately pushed voluntee...