Fourteen British children were injured when the roof of a school sports hall collapsed as they were taking an exam Tuesday morning.

Four students were seriously injured — one was flown to the hospital with a broken collar bone — after fire crews and an air ambulance were scrambled to Minster College in the Isle of Sheppey in Kent at 9:18 a.m. local time. Ten others were hurt when the heating duct in the sports hall collapsed causing the roof to partially cave in, a spokeswoman for Kent Fire and Rescue told The Times.

Ninth-graders who were in the hall at the time taking an exam were being treated at the scene by paramedics.

The college, the only secondary school on the island, is due to be demolished and moved to a new site in September as part of the government’s scheme to rebuild or refurbish the entire secondary school estate in England.

Fire crews were initially told that pupils were trapped beneath the fallen roof but everyone had been evacuated by the time the emergency services arrived at the scene.

The school has been closed for the day.

Click here to read more on this story from the Times of London.