Right-wing blogger Cameron Slater has been accused of paying a man to hack into an opposition website for political gain.
The political commentator denies the claims, but police have confirmed they are investigating the allegations made by Ben Rachinger.
The IT consultant posted his claims on the internet earlier this year, and this morning The Nation broadcast an interview with him.
In it he detailed his claims that Mr Slater commissioned him to hack into left-wing political blog The Standard to try to uncover the identities of the authors of blogs written anonymously or under pseudonyms.
The complaint is being investigated by Counties Manukau CIB.
Police say there are a number of complexities to the investigation, including the posting online of documentation which has already compromised the investigation and is making inquires more difficult.