I would ask if the other children involved in the incident have received the same treatment. If they have not it would seem that the school's actions amount to discrimination on the grounds of disability. I would write a formal letter to the headteacher, and cc the chairman of the governors and whatever body they report to (local education committee etc.) about your suspicion of discrimination and also ask for a copy of the risk assessment that they should have produced before deciding to exclude your child. If you can afford to have a solicitor write a letter on your behalf, so much the better.
I would ask if the other children involved in the incident have received the same treatment. If they have not it would seem that the school's actions amount to discrimination on the grounds of disability. I would write a formal letter to the headteacher, and cc the chairman of the governors and whatever body they report to (local education committee etc.) about your suspicion of discrimination and also ask for a copy of the risk assessment that they should have produced before deciding to exclude your child. If you can afford to have a solicitor write a letter on your behalf, so much the better.