Three Western Bay of Plenty businesses have lost "significant sums of money" through a targeted email attack in recent weeks.
Internal Affairs is warning people to be aware of a targeted email attack, also known as "whaling", that could cause significant financial losses to New Zealand companies.
Employees responsible for account payments have received what appear to be authentic emails from company managers requesting funds be transferred to off shore bank accounts on behalf of company clients.
Detective Senior Sergeant Greg Turner said the local businesses lost significant sums of money through the scam.
"Whaling" is a type of phishing scam which targets high level executives. Since the beginning of September, five companies have reported to Internal Affairs that they have recently experienced this type of attack, although the Department is aware of earlier campaigns.