After the incident on Wednesday some students had to go to hospital to be tested for infections including hepatitis and HIV.
The school said pupils were stabbed with a lancet, but police believe a diabetic pen was used.
Nine have already been tested, although health officials say the risks are very slim, but the test results won’t be known for three months.
The pupil - who police said was taking part in some sort of game - was arrested on suspicion of assault, and later released on bail.
Head teacher John Tomasevic told the BBC said: 'From what we can tell at this moment in time, evidently we are still investigating it, it wasn't malicious.
'It was more in fun and trying to get a reaction.
'A student got hold of a lancet and he went around pricking a number of other students in his immediate friendship group and wider than that.
'We found out about the incident towards the end of the school day and as a precaution we advised all parents to take their child to the hospital just for tests and just to make sure everything would be safe and secure for their child.'
The boy has since been suspended for five days by the school, which has 1,600 pupils, aged from 11 to 18.
But some parents have accused the school of failing to take the attack seriously enough.
Parent Elena Georgiou’s said her son was one of those stabbed and she said she only heard about it from another parent.
Concern: Some students at Toot Hill school had to go to hospital to be tested for infections including hepatitis and HIV.
She said 'There are going to be a lot of repercussions from what’s happened and maybe they won’t let anything like this happen again.
'There are a lot of parents, very, very angry. I don’t blame the child as much, I blame the school more for the way that they’ve dealt with it.
Defence: Head teacher John Tomasevic said he was happy with the school's response.
'The needle should never have been in the school in the first place.'
But Mr Tomasevic said he was happy with the school’s response.
'A lock down would have been an over-reaction and anyway by the time we’d even done our preliminary investigations the school day had finished so that wasn’t a possibility.'
A statement from the school said: 'The incident that occurred on June 13th has been dealt with by the school in a prompt and appropriate manner.
'The investigation of the incident has not yet been completed, but we have established that a student acquired a medical lancet (8mm in length) and used it to prick around 20 students.
'The school’s first action was to contact parents of students involved and provide appropriate medical advice.
'Health agencies emphasise the extremely low health risk associated with incidents of this nature.
'The health authorities recognise that the school has followed all advice and procedures in caring and supporting our students and their families.
Worrying wait: Nine students have already been tested, although health officials say the risks are very slim, but the test results wont be known for three months.
'It is always important for a school to maintain a calm and supportive environment and to take a proportionate view of events in order to prevent unnecessary anxiety.'
The school says the pupil who attacked fellow students has been suspended for five days while they carry out an internal investigation.
A Nottinghamshire Police spokesperson: 'Police are investigating reports that a number of children sustained minor injuries during an incident at Toot Hill School, in Bingham, on Wednesday 13 June.
'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.'
Toot Hill achieves above average GCSE and A-level results and is ranked the fourth best Nottinghamshire.
Dr Vanessa MacGregor, consultant in communicable disease control at HPA East Midlands, said: ‘No one was seriously injured, but there is a very small risk that a BBV [bloodborne virus] could have been passed on to others who were pricked with the same needle.’
Culled From The Daily Mail UK.
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