Pima County Sheriff Chris Nanos said in an interview published Tuesday, May 12, that his department, along with the FBI and other labs, are “working hard to get this resolved,” KOLD reported

The Arizona sheriff investigating the kidnapping of Nancy Guthrie is providing an update as the search passes 100 days, while also not addressing claims from a county official that he scolded her for sharing information with the FBI at the agency’s request.

The 84-year-old mother of Today co-host Savannah Guthrie was last seen on the night Jan. 31 and is believed to have been kidnapped from her Tucson, Ariz., home by a masked man in the early morning hours of Feb. 1. Authorities said alleged ransom notes sent to local media outlets further support their belief that she was taken against her will.

More than three months later, investigators have not identified any suspects.

However, Pima County Sheriff Chris Nanos recently shared an update on the case with local news station KOLD, saying his department, along with the FBI and other labs, are “working hard to get this resolved.”

“I think every day they get closer,” Nanos said in the interview published on Tuesday, May 12.

“There’s way too much work to be done, that is ongoing, with some of the physical evidence we have,” he added, presumably referencing the mixed DNA found on the property that is still being tested in hopes of identifying a suspect. “And we’re not going to give up on it just because it’s been 100 days.”

At the same time, Pima County Assessor Suzanne Droubie told The Arizona Republic in a report published Tuesday that Nanos expressed frustration with her after learning her office had shared information with the FBI at the agency’s request.

“We’re sensitive to the fact that the sheriff is under a lot of stress with all of this, but yes, there was a little bit of a negative interaction,” Droubie told the news outlet. “It was inferred that we were creating a lot of additional work for the sheriff’s department, due to us providing this information to the FBI, and then them having the responsibility to follow up on all of those leads that were provided.”

According to the Republic, Droubie further claimed: “I wouldn’t categorize it as yelling, per se, as much as kind of scolding and expressing frustration with all of the leads he was receiving, their obligation to follow up on them, and that my office was, was actually being more harm than good by providing more leads that they just had to follow up with.”

In response, the Pima County Sheriff’s Department said in a statement shared with PEOPLE Tuesday that investigators “remain committed to conducting a thorough and comprehensive investigation and appreciate the public’s continued patience and cooperation.”

“We do not have any further information to provide regarding claims made by a county employee,” the statement continued.

Nanos has recently come under increased scrutiny following criticism from FBI Director Kash Patel over his handling of the Guthrie case.