Six months after Nancy Guthrie disappeared from her Tucson home, the sheriff leading the investigation explained on Saturday why authorities recently released two purported ransom notes, saying investigators hope someone recognizes the writer’s distinctive language or phrasing.

“There are a number of pieces of information in these notes that just might jar someone to say, ‘You know, I’ve heard that,’ or the wording, the style of the writing,” Pima County Sheriff Chris Nanos said in the interview-style video.

It remains unclear if the notes were penned by the same sender.

Nanos said investigators remain actively reviewing tens of thousands of tips, videos and forensic leads as they continue searching for the 84-year-old mother of “Today” co-host Savannah Guthrie.

NANCY GUTHRIE SHERIFF SAYS INVESTIGATORS MAY HAVE MORE VIDEO EVIDENCE AS THEY REVIEW THOUSANDS OF CLIPS

CLICK HERE TO DOWNLOAD THE FOX NEWS APP

“It’s very active,” Nanos said. “We’ve got a lot of work ahead of us.”

Anyone with information is asked to call the FBI at 1-800-CALL-FBI or the Pima County Sheriff’s Department tip line at 520-351-4900.

This is a developing story. Please check back for updates.