The investigation into the disappearance of Nancy Guthrie has taken a new turn as authorities in Arizona focus on a potential incident at her home weeks before her abduction. The Pima County Sheriff’s office, under the leadership of Sheriff Chris Nanos, is examining events from an evening three weeks prior to the time when the 84-year-old mother of “Today” show host Savannah Guthrie was reported missing.

Sheriff Nanos, who has been under pressure due to the prolonged and so far unsuccessful search spanning 52 days, revealed that investigators are concentrating on January 11. This date has gained significance following analysis by the FBI of various digital and electronic data. Nanos shared this insight with KOLD news on Monday but remained tight-lipped about the specifics of the evidence pointing to that particular evening.

Authorities suspect that Nancy Guthrie was abducted from her Tucson residence in the early hours of February 1. Supporting this theory is unsettling footage from her doorbell camera, which shows a masked individual lingering near her doorstep on the night of her suspected kidnapping.

Nanos, who is leading the probe, refused to expand on what evidence had led investigators to that evening in particular.

Guthrie is believed to have been snatched from her Tucson home during the early hours of Feb. 1.

Chilling security footage later recovered from her doorbell camera captured a masked man loitering around her doorstep the night police believe she was kidnapped.

Meanwhile, as the search for the grandmother entered its seventh week, her family was still clinging to hope someone would come forward with critical information that could help crack the case.

“We continue to believe it is Tucsonans, and the greater southern Arizona community, that hold the key to finding resolution in this case,” the family’s statement said.

“Someone knows something. It’s possible a member of this community has information that they do not even realize is significant. We hope people search their memories, especially around the key timelines of January 31 and the early morning hours of February 1, as well as the late evening of January 11.

“We desperately ask this community for renewed attention to our mom’s case – please consult camera footage, journal notes, text messages, observations or conversations that in retrospect may hold significance,” they added.

The timeline of the disappearance of Savannah Guthrie’s mom:

“No detail is too small. It may be the key.”