Emergency services in London have treated 88 people for injuries following an horrific ceiling collapse at the West End's historic Apollo Theatre on Thursday (19Dec13). The packed venue, which opened in 1901, had to be evacuated after part of the roof appeared to cave in during a performance of the critically-acclaimed play The Curious Incident of the Dog in the Night-Time. Police, paramedics and firefighters were called to the scene shortly after 8.15pm local time as audience members and theatre staff rushed towards the exits as debris fell from above. A number of people were trapped inside the building by the falling concrete, but they have all since been freed thanks to a rescue mission organised by emergency personnel, who had had the area around the Shaftesbury Avenue theatre cordoned off to the public. Seven people were hospitalised with serious injuries, while the other 81 have been described as "walking wounded". There have been no reported fatalities. A representative for the London Fire Brigade has since confirmed that "heavy plaster" from a section of the ceiling collapsed, taking parts of the balconies with it as it crashed down to the ground. The cause of the incident is still under investigation.