Department spokesman Oupa Bodibe says it is believed that the teenager had entered the classroom alone when the incident took place.
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“It is however unclear at this stage what happened to cause the accident.
“The district officials have also visited the scene today (Tuesday) and a formal investigation will be conducted by the department.
“Our condolences and sympathy go out to the family,” he says.
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Tsakane police spokesman Sgt Lerato Mngomezulu says they have opened an inquest to investigate the incident which occurred at the school at about 11.45am while it was raining.