Greenfields School and Sports College in Goldings, Northampton has been evacuated following a suspected chemical leak.
Police are still at the scene to deal with traffic management and support the Fire and Ambulance services. No children have been hurt as a result of the incident.
Residents in the immediate area have been asked to keep windows and doors closed whilst the incident is dealt with.
Two adults are being treated at Northampton General Hospital with mild breathing difficulties.
More top news
Northamptonshire Police is to make changes to the way it fights crime - to improve its efficiency and flexibility.
Chilly at first. Then, dry for most with sunny spells. Feeling warm in the sunshine.
Papworth Hospital in Cambridgeshire is to be given a royal title after the Queen approved the honour.