POLICE are investigating after 26 pupils were stabbed in the head and neck with an insulin needle.
The attacks happened at Toot Hill secondary School, Bingham, Notts at lunch break on Wednesday.
Nine of the victims were taken to hospital to be tested for infections including HIV and hepatitis.
They now face a 90 day-wait before the test results are known but health experts say there is very little risk that they have been infected.
The attack by the 14-year-old boy is being treated as "not malicious" but more like a "random act of silliness".
Head teacher John Tomascevic said: "A student got hold of a Lancet and he went round pricking a number of students in his friendship group and wider than that.
"We found out about the incident at the end of the school day.
"As a precaution we advised all parents to take their child to hospital for tests."
Mr Tomascevic described the incident as "not malicious" and more likely an act of "random act of silliness."
The boy has been suspended by the school while investigations are carried out.
A Notts police spokesman said: "Police are investigating reports that a number of children sustained minor injuries during an incident at Toot Hill School, in Bingham.
"We are currently working with the school to establish what happened.
"The parents of about 26 pupils affected have been informed and some have sought medical advice after, what is believed to be a diabetic pen, was used.
"Enquiries are ongoing."