A number of Manchester Grammar School pupils have been taken to hospital after a chemistry exam went wrong.
It is believed a class of year nine boys had been sitting an exam when they accidentally produced a quantity of sulphur dioxide.
A 'small number' of students were said to have felt the effects of the chemical compound, which can cause irritation to the throat and nose if inhaled.
They have been taken to hospital as a precaution, a spokesman said.
It is not believed that any of the pupils were seriously hurt.
Lessons were said to have been carrying on as usual on Friday afternoon.
Nobody has been evacuated from the school.
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A spokesman for MGS said: "On Friday, October 11, following a routine chemistry experiment during a lesson, a number of boys in a lesson being held in another room began to feel unwell as a result of gas produced by the experiment.
"The emergency services were called and all the boys affected were assessed by the ambulance service.
"A small number of boys have been taken to hospital, purely as a precaution, and their parents have been informed."
