It is alleged that the grade 10 pupil stabbed the teacher while the class was writing a test.
The department says counselling will be provided for those who witnessed the incident on Thursday.
The 17-year-old pupil has been taken in for questioning.
Spokesperson Elijah Mhlanga says: “There was also another teacher inside the classroom and this learner approached the teacher, who had spoken to him strongly yesterday (Wednesday) and stabbed him and he ran away, he was then chased.”
(Edited by Leeto M Khoza)
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