Investigative journalist Nicky Hager is calling for an independent inquiry into a raid conducted by the SAS in Afghanistan that he says was in retaliation to an NZ soldier's death.
Mr Hager released his new book in Wellington this afternoon, three years after the release of Dirty Politics shortly before the 2014 election.
The book is called Hit & Run - The New Zealand SAS in Afghanistan and the meaning of honour and is co-written by war writer Jon Stephenson.
Mr Hager said this afternoon the book reveals a "dark and dirty secret" about the New Zealand SAS in Afghanistan and is calling on an independent inquiry into the raid.
He spoke to people who said there were breaches of international law and war crimes and the information was deliberately suppressed.
Mr Hager says former Prime Minister John Key signed off on a raid by the SAS in Afghanistan that was in retaliation to a NZ soldier's death.
He says six villagers were killed and 15 injured in the raid and that the SAS burnt up or blew up about a dozen houses in the town.
Mr Hager says the SAS covered it up and denied it when later asked about it and that no insurgents were killed or found.
He alleges it breached international law and may have been a war crime and that an apology is needed to villagers and the SAS needs to be accountable.
The New Zealand Defence Force says it stands by its statement made in April, 2011, after allegations of civilian casualties were made.
The New Zealand Defence Force stands by the statement it made dated 20 April 2011.
"These were investigated by a joint Afghan Ministry of Defence, Ministry of the Interior and International Security Assistance Force (ISAF) assessment team, in accordance with ISAF procedures," the Defence said in a statement tonight.
The NZDF is confident that New Zealand personnel conducted themselves in accordance with the applicable rules of engagement- NZDF
"The investigation concluded that the allegations of civilian casualties were unfounded.
"The NZDF does not undertake investigations or inquiries into the actions of forces from other nations.That was the role of the joint Afghan-ISAF investigation.
"The NZDF is confident that New Zealand personnel conducted themselves in accordance with the applicable rules of engagement."
Dirty Politics was based on internal communications between right wing Whale Oil blogger Cameron Slater and a network of National Party figures, provided to him by an anonymous hacker.
Last month Mr Hager filed a human rights claim against Westpac over a decision to give police his account details, without asking for a warrant, as part of a police investigation to identify the hacker.
In December, a court found a 10-hour search of Mr Hager's Wellington home in October 2014 was illegal because police had not told the court they were conducting a "media search" when they applied for a warrant.
A separate claim against the police is currently before the High Court.