A boy reportedly "got hold of a diabetic insulin needle" at St Joseph's Junior School, Swansea, and stabbed others over the space of two hours.
A source told Wales Online "another child had to remove it and got pricked in the process".
All children are currently being treated at Morriston Hospital, Swansea following the incident last week.
They will need "blood tests, hepatitis injections and check-ups for the rest of the year", the source added.
Neath Port Talbot Council have not confirmed how many pupils have been affected.
Apologising, Head Teacher Caroline May said in a statement: "The school would again like to express its sincere apologies to all pupils involved.
"All pupils involved have been assessed by medical professionals and we have had reassurances that there is no further cause for concern.
"The school has since met with the parents of these pupils to discuss the issue and is reviewing its procedures around pupils who need to self-medicate to mitigate any future risks of such an incident reoccurring.”
More to follow…
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