Police have released handwriting samples as part of an investigation into more than 100 letters, with some allegedly threatening politicians, religious organisations and community leaders over the past decade.

The letters, sent between 2015 and 2026, featured bold block-capital writing, red underlining, newspaper clippings, headline cuttings and photos of known public figures.

Some letters were signed “Scorpio” or “Bullit”, while others featured unusually prominent capital letters, particularly “F”, “L”, “T”, “N” and “H”.

Police said much of the correspondence focused on national issues and matters of public interest.

The investigation is being led by the NSW Police Security Investigation Unit under Strike Force Yewrangara, while the Australian Federal Police’s National Security Investigations team is separately examining similar letters sent to parliamentarians and community groups.

NSW Police Acting Superintendent John Walke said investigators believed they were making progress.

“We believe the offender is of caucasian appearance and in his 60s,” Walke said.

“So we are appealing to the community if they recognise any of the symbols or names in the letter excerpts and can relate them to someone of that profile to please let police know.

“We are determined to bring this person to account because their behaviour is certainly offensive and at times threatening, and people deserve to go about their work without being subjected to threats.”

AFP Superintendent Nathan Robertson said authorities were also focused on preventing the alleged behaviour from escalating.

“We have very real concerns about the content of these letters, and people in public life deserve to go about their jobs or careers without being subject to harassment or threats,” Robertson said.

“Our investigations are into allegations of criminal behaviour, but we also have concerns about whether the person responsible for them has access to appropriate health and support services.”

Police are urging anyone who recognises the handwriting or has information that could assist the investigation to contact Crime Stoppers.

Image: NSW Police