An anonymous tip pertaining to the disappearance of Nancy Guthrie sent a Mexican volunteer group looking for the missing Arizona woman‘s remains just south of the U.S. border.

The nonprofit organization Buscando Corazones de Nogales Sonora told local media that it received a call on Mother’s Day, pointing volunteers to an unmarked grave near the Mexican border town of Nogales.

“It was a man and he said to go look in that area, and said that’s where the missing woman from Tucson was,” a representative from the group told Arizona’s Family newsgroup.

Up to 15 volunteers searched the area on May 16, but had no luck. After receiving more specific information, they tried again in vain on Wednesday. They believe they were close and plan to search again next week roughly four miles south of the Arizona border.

Guthrie, the 84-year-old mother of NBC News host Savannah Guthrie, went missing from her Tucson home on Feb.1.

Local, state and federal investigators have released few clues about her disappearance with regards to suspects or a motive. Video retrieved from a doorbell camera outside Guthrie’s home in February shows an armed masked man outside her door shortly after she was last seen by family.

The Pima County Sheriff’s Department said its investigation remains active, though Arizona police are not involved in the search taking place in Mexico.

“We are aware of reports regarding an anonymous tip related to the Nancy Guthrie investigation that was provided to a group in Mexico,” sheriff’s deputies said in a statement. “At this time, we have not been contacted by Mexican authorities.”

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