Auckland Transport has sacked a senior manager amid an investigation into allegations of corruption over roading contracts.
The council body's chief executive, David Warburton, says the investigation has established "serious conflict of interest and performance issues" involving the official, whom it stood down on leave a month ago.
He said those came to light after an internal review of procurement and contract management procedures.
Invoices, contracts and other documents dating back to 2010, which is when Auckland Transport was established as a council-controlled organisation, were being reviewed.
A number of staff, supplier representatives and other stakeholders had also been interviewed.