At least a "handful" of Nazi war criminals could have lived out their lives in New Zealand without facing justice for atrocities, says a former police detective who led a 1992 investigation to track down former Nazi collaborators.
Wayne Stringer spent a year investigating 47 people who arrived in New Zealand as "displaced" people from former Nazi-occupied countries after World War II and were suspected war criminals.
But 20 years on from the country's only such investigation, the 56-year-old said he was still frustrated no one was charged.
The year-long investigation was conducted after Jewish organisation the Simon Wiesenthal Centre sent the New Zealand Government a list of people thought to have collaborated with the Nazis to commit atrocities.
Mr Stringer said he approached the investigation as an unsolved murder.