This online photo shows the site of the accident. [Photo from official Weibo account of the Beijing-based Mirror]

More than 20 students were injured and rushed to hospital on Saturday night after an auditorium's stage collapsed in a prestigious Beijing university, local newspaper the Mirror, a Chinese legal newspaper, reported.

Students were staging a rehearsal in the auditorium at Beihang University.

Ambulances arrived to transport the injured to hospital.

The reason for the accident remains unknown.

This online photo shows medics attending the injured. [Photo from official Weibo account of the Beijing-based Mirror]

This online photo shows several ambulances arriving outside the building. [Photo from official Weibo account of the Beijing-based Mirror]