Police officers trying to stop another terror attack are visiting social media users who post conspiracy theories and people who unwittingly bought goods from websites with far right or white nationalist links.

Others winding up on the police "persons of interest" list have been dobbed in - sometimes maliciously or ignorantly - by members or the public.

A Herald investigation into efforts to thwart new terror attacks have found police scrambling to fill an intelligence void on white supremacy with targeting causing upset across the country.

It has also had successes with illegal weapons and homemade bombs found, such as