Two students from a school in Wiltshire have been taken to hospital after a chemical incident.
It is believed a release of sulphur dioxide gas at Ridgeway School in Wroughton near Swindon affected 90 pupils over three classrooms.
The cause of the accident appeared to be a science experiment that had gone wrong, a fire service spokesman said.
"Affected pupils are being treated at the scene but the gas is not a threat to surrounding homes," he added.
A spokesman for Great Western Ambulance said the service received a call from the school science lab at 1210 BST.
"Two doctors and a nurse have been sent to the school," he added.
Excessive exposure to sulphur dioxide can affect the eyes, lungs and throat.
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