The falling screen appeared to hit a dancer directly on the head and body before falling on another performer as the audience screamed in horror. The rest of the performers on stage rushed to help those hit by the screen, the videos showed.
Police said the two male dancers were conscious when they were sent to Queen Elizabeth Hospital. Local media reported that the hospital said one of the dancers was in serious condition, while the other was stable.
Police said three spectators were also taken to hospital, one who felt unwell and two others in shock, but they did not require medical treatment.
The concert was canceled after the incident, which took place during Mirror’s fourth of 12 scheduled concerts at the Hong Kong Coliseum.
During Tuesday’s concert, band member Frankie Lui appeared to lose his balance and fall off the edge of the stage while giving a speech, according to social media clips.
An online petition on security issues of Mirror concerts was launched the same evening and has gathered thousands of signatures. The petition urged organizers to ensure the safety of Mirror and its dancers and not to use unnecessary stage mechanisms or elevated platforms.
Viu, the company that created and operates Mirror, did not respond to an email request for comment.
The 12-piece band has become extremely popular in Hong Kong and has been credited with the revival of Cantopop.