article_snippet: Police appealed for public help to find the alleged blackmailer, at a press conference in Wellington Tuesday.
article_snippet: Police revealed an investigation had been underway since November, when anonymous letters were sent to giant dairy cooperative Fonterra and a farmers' lobby group.
article_snippet: Police said an Auckland-based investigation team was pursuing a number of lines of inquiry in locating the source of the threat, but the time was right to appeal to the public.
article_snippet: Deputy Commissioner Mike Clement also called on the alleged blackmailer to come forward.