Investigators hunting for leads in the search for Nancy Guthrie have asked people living in her neighborhood whether they noticed any disruptions to their internet connections on the night of her disappearance.

Both the Pima County Sheriff’s Department and the FBI were out canvassing in Guthrie’s neighborhood in the Catalina Foothills in Tucson, Arizona, on Thursday, going door to door talking to residents and asking if they noticed anything about their connectivity.

Three different homeowners from the neighborhood told NBC News that the agents who came by their home Thursday specifically asked them if they had noticed any disruptions or issues with their internet service the night that Guthrie went missing.

According to those homeowners, the agents told them that several people who live in the area have mentioned that there were glitches with their internet that night.

The FBI and the sheriff’s department have not commented on the reported internet issues or said why investigators are asking this line of questioning.

When asked by NBC News earlier this week whether he believed the suspect may have had a Wi-Fi jammer on him, perhaps sticking out of his pocket, when he showed up at Guthrie’s home, Pima County Sheriff Chris Nanos said: “I’ve not looked at that closely, but yeah, I know that my team has looked at it with the FBI every angle.”

The three homeowners who spoke to NBC News all said they were either asleep or not home at the time, and couldn’t say if they had internet issues.

Guthrie has now been missing for more than a month, and investigators have yet to publicly identify any suspects or persons of interest in her disappearance.

The 84-year-old mother of “TODAY” co-anchor Savannah Guthrie was last seen around 9:45 p.m. Jan. 31 after having dinner with her other daughter, Annie Guthrie.

She was reported missing Feb. 1 after she didn’t show up to a friend’s house in Tucson to watch a livestreamed church service, as she did most Sundays.

Authorities have said the case appears to be a kidnapping or abduction, but further details have been hard to come by.

Last month, the FBI released doorbell camera videos and images of an armed and masked man who was wearing gloves outside of Guthrie’s home in the early hours of the day she went missing.

The person has been described as a suspect, but investigators have not identified the man.

Officials are looking for a man who is 5 feet, 9 inches to 5 feet, 10 inches tall, with an average build. In the doorbell camera images, he was wearing a black, 25-liter Ozark Trail Hiker Pack backpack.

On Thursday, Savannah Guthrie, who has been on leave from her position at the “TODAY” show and in Arizona with her family, visited the studio in New York City and said she plans to return to her post.

“While she plans to return to the show on air, she remains focused right now supporting her family and working to help bring Nancy home,” a spokesperson for the show said in a statement.

The Guthrie family announced Feb. 24 that it is offering a $1 million reward for any information that leads to the 84-year-old’s recovery. It is in addition to rewards being offered by the FBI and Crime Stoppers.