Investigations into allegations that three KwaZulu-Natal teachers hurled racial insults at their Indian principal have been completed, an official said on Friday.

But the KwaZulu-Natal education department declined to reveal the findings.

"The department is considering the recommendations which were made after the investigation was completed," spokesman Sihle Mlotshwa said on Friday.

Asked what the investigation had revealed or what the recommendations were, Mlothswa said: "It is an internal matter."

The alleged incident took place at Khulabebuka High School in Umbumbulu, on the outskirts of Durban in October.

The Mercury Newspaper reported on Friday that the teachers had made racial remarks directed at principal Premilla Deonath.

The teachers allegedly taunted the principal by singing Mbongeni Ngema's infamous Amandiya song in her presence. The lyrics to the songs were ruled to be racially offensive by the South African Human Rights Commission in 2002.

Khulabebuka's school governing body secretary Ncamisile Ngcobo was quoted as saying that trouble started last year in September when all three teachers were absent for a month.

They provided a medical certificate from the same doctor on their return.

"On their return, they were greeted by angry parents and pupils who demanded to know why they had been absent from work. They then told the parents they would only teach if the Indian principal left the school," Ngcobo said.

The three teachers are apparently members of the SA Democratic teachers Union (Sadtu).

Comment could not be immediately be obtained from Sadtu regional secretary Sva Xulu.