A pupil from Norwich's Jane Austen College remains in a serious condition in Addenbrooke's Hospital in Cambridge after suffering head injuries after a fall from height.
It is understood the pupil fell down a stairwell and sustained serious head injuries at the Colegate school at about 3.30pm yesterday.
He was treated by paramedics from the East Anglian Air Ambulance, and the East of England Ambulance Service sent a rapid response vehicle and ambulance crew.
Critical care paramedic Chris Neil, of Norfolk Accident Rescue Service, was also on scene in a rapid response vehicle.
The pupil, whose age has not been confirmed, was airlifted to Addenbrooke's Hospital in Cambridge - a specialist trauma and head injury centre in the region.
A spokesman for the school said: 'Our thoughts are with him and his family. We are making sure that fellow students have the support they need both immediately and in the days ahead.
'We are very grateful for the quick response and professionalism of the ambulance service, air ambulance, and police.'
The Health and Safety Executive are due to visit the school tomorrow.
The critical incident team from Norfolk County Council's children's services department was at the school today to support students.
And the school's principal Rebecca Handley-Kirk sent a letter home to parents explaining that there had been an incident and urging parents to keep a close eye on the effect on their children.
She wrote: 'As you are probably already aware one of our students was admitted to hospital on Monday afternoon following an incident at the school. Our thoughts are with him and his family.
'We are very grateful for the quick response and professionalism of the ambulance service, air ambulance, and police.
'Students were told this morning by their form teacher and support has been available to them throughout the day from the critical incident team from Norfolk County Council children's services.
'Young people who experience an unusual event will try and make sense of what happened. It's quite normal for them to be upset for quite a while. They may feel angry, sad, guilty, scared, confused or any combination of feelings.
'They will worry less if you can help them to see that their reactions are normal and understandable. You can help them feel safe by sticking to their normal routines as much as possible and continuing with everyday activities.
'Your child may or may not want to talk about it, but it is likely that they will need your special care, attention and reassurance in the coming days.
'We will try to keep the school as normal as possible, with additional pastoral support available.'
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