The investigation into the disappearance of 84-year-old Nancy Guthrie has entered its seventh week, with FBI agents reportedly focusing on evidence from two specific dates in the days before she vanished from her Arizona home.

According to reports, investigators believe Guthrie's abductors may have been surveilling her Tucson residence for weeks before the crime occurred. The FBI has been requesting home security footage from neighbors that may have captured activity during the timeframe under investigation.

The case has drawn attention from law enforcement experts, including retired K-9 specialists who have questioned certain aspects of the investigative approach. A retired K-9 officer has raised concerns about the decision not to deploy cadaver dogs in the search, though authorities have not publicly explained their methodology choices.

Guthrie's disappearance has prompted an extensive investigation involving federal agents, though few concrete details about the case have been released to the public. The focus on pre-disappearance surveillance suggests investigators are working to establish a timeline of events leading up to the incident.

The FBI has not provided updates on potential suspects or motives in the case. The investigation remains active as agents continue to gather evidence and interview witnesses in the Tucson area.