The festival has acknowledged that a female extra was seriously injured when she fell off the top stage level during a rehearsal of Mozart’s Magic Flute.
The injured woman was rushed to hospital with a broken limb.
An official statement said: ‘There has been an accident at work, that has also been reported and is regrettable. In the Magic Flute, which is a very complex stage design, we made sure that all the artists and extras were instructed accordingly. Normally, a serious accident where negligence is suspected is investigated. That’s not the case. It was an unfortunate accident.’