The Serious Fraud Office has commenced investigations into donations made in relation to the Auckland and Christchurch mayoral elections.
The SFO in statements released last month confirmed it had separate referrals from police in relation to Auckland Mayor Phil Goff's election expenses and Christchurch Mayor Lianne Dalziel's expenses.
Today, it confirmed official probes had began.
A spokesperson for Goff's Mayoral campaign said there has been "no communication" from the SFO about launching an investigation.
"They are yet to contact make contact with any details of an investigation. We will not be making any further comment until we have been contacted about this."