Key keywords: Nancy Guthrie missing person, 2016 Nancy Guthrie disappearance, US-Mexico border remains search, anonymous tip cold case lead, Nancy Guthrie Mexico burial site, cross-border law enforcement cold case investigation, El Paso border missing person remains search, unsolved Ohio missing person case Law enforcement officials from the United States and Mexico have launched a coordinated search for the remains of Nancy Guthrie, a 38-year-old Ohio woman who was reported missing in September 2016 after she failed to return home from a planned road trip to the Southwest with her then-boyfriend. The search effort comes after a recently submitted anonymous tip sent to the FBI’s Cincinnati field office provided specific, previously unpublicized details about Guthrie’s alleged death and burial location in a remote patch of northern Mexico less than 2 miles from the El Paso, Texas, border crossing. Before the tip emerged, Guthrie’s case had been classified as a cold case for nearly 7 years, with investigators following hundreds of unsubstantiated leads that spanned 12 U.S. states and multiple regions of Mexico, none of which yielded concrete evidence of her whereabouts. Guthrie’s family, who have advocated relentlessly for answers over the past decade, submitted updated DNA samples to the FBI last week to enable immediate identification if human remains are recovered during the search. As of Wednesday, the multi-agency search team, which includes FBI special agents, K9 units trained in human remains detection, Mexican federal law enforcement officers, and forensic specialists equipped with ground-penetrating radar, has cleared roughly 30% of the 4.2-acre search zone identified in the anonymous tip. Officials leading the operation told reporters that the tip’s level of specific, non-public information about Guthrie’s final days has led them to classify the lead as “highly credible,” though they cautioned that it could take up to two weeks to fully search the rugged, brush-covered area. Guthrie’s older sister, Lisa Guthrie-Moore, released a statement earlier this week thanking the anonymous tipster for coming forward, and asking members of the public who may have additional information about Nancy’s 2016 trip to the border to contact the FBI’s tip line, which is accepting anonymous submissions 24 hours a day. Investigators have not publicly commented on whether they are considering potential suspects in connection with Guthrie’s disappearance, noting only that the search remains their top priority for the case at this time.