A group that works to locate missing people in Mexico said they searched for Nancy Guthrie after they received an anonymous tip that she was buried around the border in an unmarked grave.

Ramona Guadalupe Ayala Ortiz, head of Buscando Corazones Nogales, said the group received a tip on Wednesday about Guthrie, 84, who was abducted from her Tucson, Arizona, home more than 70 miles north of the border city of Nogales.

The group carried out an initial investigation of the area provided by the tipster, where they previously found 25 unmarked graves, but the search for Guthrie came up empty, Ayala Ortiz told El Imparcial.

Despite the roadblock, the groups said they would continue future search operations in the area to find Guthrie and any other missing persons.

The area, known as “Mariposa” or butterfly in English, is located northwest of Nogales, with the latest search piercing deeper than when the group found the initial graves earlier this year.

“We received an anonymous call telling us that the woman’s [Guthrie’s] remains were in the Mariposa area — in a grave over a stream,” Ayala Ortiz said of the tip, which provided clues as to where exactly the tomb might be.

The search effort was also conducted with the help of the Sonora State Commission for the Search of Missing Person, with municipal and state officials providing security forces to keep the volunteers and workers safe.

Guthrie, the mom of “Today” show host Savannah Guthrie, vanished from her home in the early hours of Feb. 1, with the investigation into her disappearance still ongoing.

Guthrie is believed to have been taken from her Catalina Foothills home, but no arrests have been made and no new leads have manifested.