Emergency services have been called to Greenfields School and Sports College in Goldings, Northampton, because of a suspected chemical spill.
The fire service is handling the incident at the school for disabled children, in Prentice Court, and police and East Midlands Ambulance Service are providing support if needed.
“We’re aware that the school is planning to close for the day and are contacting parents.”
It is believed that the chemical spill was near the school’s swimming pool. Early reports say that two chemicals mixed in the plant room and created chlorine gas.
Nobody has been reported ill or injured. The fire service said there is no risk to surrounding residents.
More top news
Officers arrest fans on suspicion of criminal damage, assault and being drunk and disorderly during Norwich's clash with Ipswich.
Blues' lead is wiped out as Canaries produce another late-show to draw.
Timm Klose equalises for City in stoppage time to cancel out Luke Chambers' late header for Ipswich