New Delhi, Aug. 1 -- Authorities investigating the kidnapping of Nancy Guthrie, the mother of "Today" show co-host Savannah Guthrie, have released two purported ransom notes six months after her disappearance, hoping the messages will help identify those responsible.

The Pima County Sheriff's Department on Friday published copies of the emails, which investigators say were sent by the suspected kidnappers, Reuters reported. Officials believe the wording and writing style could provide clues that someone familiar with the author may recognise.

The release accompanies a renewed appeal for information about a masked individual captured on Nancy Guthrie's doorbell camera shortly before she disappeared from her Tucson, Arizona, home.

The fi...