Parents had shortly thereafter rushed to the school in a panic, wanting to find out if their children were safe.
In a bid to calm the parents, school officials assured the parents that there was no threat at the school and told them they were welcome to take their children home if they so wished.
One panicked parent, with reddened eyes, who came to the school, spoke on the phone expressing relief that the slain child was not hers.
The stabbing had in fact happened a few streets away from the school.
ER24's Russell Meiring said the pupil had been stabbed in the chest.
All efforts to revive him failed.
The motive for the killing was not immediately clear.
This is a developing story.