While the earlier death toll had been placed at 22, she explained that 17 people had died on the scene while three others had died in hospital.
Two remained in hospital in a critical condition.
Families of the deceased were yet to identify them.
Tikana-Gxothiwa said the families who believed their children were among the victims would be ferried to the mortuary for the identification process, saying it would be chaotic to do this at the scene.
Police minister Bheki Cele was headed to the Eastern Cape where he was to join other government officials, including premier Oscar Mabuyane who was already on the scene.
This is a developing story.