A few seconds of doorbell footage has become the most replayed fragment in the search for Nancy Guthrie, 84, after investigators said they believe she was taken from her home in Tucson, Arizona, during the night. US outlets have reported that the FBI has been in touch with Mexican authorities about the case, although officials have not confirmed Guthrie is in Mexico and no public, verified sighting has been announced.

The hard facts, for now, fit on a short list, even if the internet keeps trying to pad it out. Guthrie was reported missing on Feb. 1 after failing to show up for church, according toCBS Newsand law enforcement has described the disappearance as an apparent abduction.

The Mexico question persists largely because of geography and procedure, not because investigators have publicly produced proof of a border crossing. CBS News has reported Tucson is about 60 miles from the Nogales crossing, a distance that makes cross-border coordination a practical consideration in time-critical cases.

It also described how that coordination can work, reporting that the FBI has border liaison agents and that its legal attaché office in Mexico City helps connect the Bureau with Mexican counterparts and the U.S. Embassy. In that context, CBS News, citing law enforcement sources, claimed that the FBI has been in touch with the Mexican government and Mexican law enforcement about Guthrie's disappearance.​

Similarly,People Magazinereported that the FBI is in contact with Mexican authorities, while adding a note of caution from the local agency leading the case. In a statement obtained by the publication, the Pima County Sheriff's Department said it was 'not confirming or releasing any details' about several investigative matters, including 'working with Mexican authorities' and that there was 'no evidence Nancy was taken across the U.S.-Mexico border.'​

Nothing about Guthrie's location has been confirmed publicly, so the Mexico angle remains just that.

The timeline released through reporting is uncomfortably specific in places and blank in the middle where it matters most.ABC7 New Yorkstated in its report that Guthrie was last known to be at home late on Jan. 31 after being dropped off by family, and relatives called 911 on Feb. 1 when they could not find her.

CBS News later reported that investigators believe Guthrie's doorbell camera disconnected at 1:47 a.m., and her pacemaker disconnected from the pacemaker app on her cellphone at 2:28 a.m. Law enforcement sources, as cited by the publication, said authorities have mounted a high-tech tracking device known as a 'signal sniffer' on a helicopter in an attempt to detect electronic signals emitted by her pacemaker.​

David Kennedy, who supplied the device, told CNN: 'All we need is one small transmission, and it's focused solely on her pacemaker's address. We are only tracking Nancy's address; this could absolutely work.' To recall, Savannah Guthrie described her mother's health as 'fragile' and said she 'lives in constant pain,' underscoring why investigators have treated the case as urgent.

REMINDER: FBI reward of up to $100,000 for information leading to the location of Nancy Guthrie and/or the arrest and conviction of anyone involved in her disappearance.The suspect is described as a male, approximately 5’9” - 5’10” tall of average build.Report tips to…pic.twitter.com/PrFkHPj9Ac

Source: International Business Times UK