A local search party group out of Nogales, Mexico, began searching for Nancy Guthrie this week after fielding an anonymous tip about her remains being buried in the Mariposa area near the Arizona-Mexico border.

The tip and subsequent search party for Guthrie’s remains comes more than four months after she was abducted from her home outside Tuscon, Arizona, on Feb. 1. The abduction of Guthrie, the mother of Today host Savannah Guthrie, has sparked national questions and a massive investigation, with the search effort now spreading internationally into Mexico.