The Teaching Council is investigating a situation which has led to the sudden resignation of the principal of Wallacetown School, near Invercargill.
The council said it has received a notification relating to an "alleged incident" involving former principal Neville Hore.
'We are in the early stages of investigation," the council said.
"We are unable to provide further details on individual cases – the process is confidential and the council is subject to the Privacy Act."
School board of trustees chair Carl Stewart said the board told school parents in May that "there was a matter involving a staff member that was being investigated and that an acting principal would be put in place in the meantime".