The investigation into the harness racing industry has spread to Auckland, police say.
So far, 13 of some of the most high profile names in the sport are facing race-fixing and drugs charges.
All of the races until now have been based in the South Island.
Today police said Operation Inca had uncovered possible race-fixing involving at least one meeting in Auckland in May this year.
They say the Racing Integrity Unit has informed it of the allegations and further charges are possible.