The search for missing 84-year-old Nancy Guthrie from Tucson, Arizona, has intensified as federal investigators zero in on a chilling suspect description captured on surveillance footage near her home, featuring a black backpack, layered nitrile gloves, and a face covering.

Guthrie was last seen on January 31, and the case has now entered its third week with authorities treating her disappearance as an active investigation. FBI officials have released key details from the footage, hoping to spur public tips that could crack the case wide open.

The surveillance video shows a masked individual outside Guthrie's residence in Tucson. Through detailed analysis, the FBI determined the suspect is a man standing between 5-foot-9 and 5-foot-10 tall with an average build.

One of the most distinctive elements is the suspect's backpack: a black 25-litre Ozark Trail Hiker Pack. Investigators have highlighted this brand-specific identifier, noting it could be crucial in generating leads from the public who might recognize the item.

Adding to the suspect's suspicious attire, he was wearing nitrile gloves pulled over another pair of gloves—a layered approach that has become central to the FBI's probe into the circumstances surrounding Guthrie's vanishing.

The combination of the face covering, gloves, and backpack suggests a deliberate effort to conceal identity, prompting federal agents to urge anyone with information about similar sightings in Tucson to come forward immediately.

As the investigation presses on into its third week, the release of these precise details underscores the FBI's determination to bring Nancy Guthrie home, with the Ozark Trail backpack emerging as a potential game-changer in identifying the person of interest.