Footage has emerged from Beijing, China of the moment a concert hall stage in a university collapsed during the last few minutes of the final performance, causing over twenty casualties.

In the video, captured in Beihang University on Saturday evening, the middle three rows of the students suddenly disappear and fall through the stage while everyone is singing the Happy Birthday song in preparation for the last bow.

According to news reports, 25 people were immediately sent to local hospitals but all escaped serious injuries.