The search for Nancy Guthrie has been going on for two weeks now, and still, there’s no sign of the missing 84-year-old. 

Nancy mysteriously vanished from her $1 million home in Tucson, Arizona, on February 1, prompting an intense kidnapping investigation that’s caught the attention of the entire country. 

On Saturday evening, federal officials launched a rare ‘signal sniffer’ that could hopefully help investigators track down her pacemaker. 

Nancy, the mother of beloved Today Show host Savannah Guthrie, had her implanted medical device connected to her iPhone and Apple watch. Around 2.30am on the day of her disappearance, the pacemaker stopped syncing with her devices. 

The ‘signal sniffer,’ a compact device, was seen on the skids of the Pima County Sheriff’s Department helicopter as it flew over the Tucson area Saturday night. 

The latest move by investigators comes after authorities released a chilling video of an unidentified masked man, armed with a gun, trying to obscure the doorbell camera on Nancy’s front door. 

Several people have been questioned in connection to with her disappearance, but were later released. A series of ransom notes have also been sent to media outlets, including TMZ, demanding at least $6 million in bitcoin from the Guthrie family. 

Follow along for more details as the investigation unfolds. 

Investigators deploy rare device in bid to locate Nancy’s pacemaker

Officials installed a ‘signal sniffer’ on a Pima County Sheriff’s helicopter on Saturday evening to see if the rare device can potentially locate Nancy’s pacemaker.

The 84-year-old had the medical device, which regulates a person’s heartrate, linked to her iPhone and Apple watch.

Around 2.30am, the pacemaker stopped syncing with her personal devices.

The missing elderly woman is required to take medication for her serious potential heart condition.

Nancy Guthrie missing for two weeks now

The 84-year-old has not been seen or heard from for two weeks now.

Investigators continue to search for her, examining ransom notes and combing through footage of her captor.

A video released last week showed an unidentified masked man, donning a black backpack and black nitrile gloves, as he tried to obscure the doorbell camera with his hand and shrubbery that he pulled from her front yard.

The man also had a gun tucked into the front of his pants.