Harrowing video shows a large screen crushing performers during Hong Kong boy band Mirror's show. Fans had warned that the set seemed unstable.

• A large screen crushed performers of Hong Kong boy band Mirror at their Thursday night concert.
• Two of the performers were injured and one is in critical condition, CNN reported.

A giant LED video screen fell on stage at Hong Kong boy band Mirror's Thursday night show, injuring two performers on stage.

Harrowing videos of the collapse appear to show one of the group's dancers being crushed under the screen after it apparently hit his neck.

As other members rushed to their aid, the screen appears to collapse on another performer.

The two performers were rushed to the hospital, Variety reported. One performer had a head injury and is in stable condition while the other sustained a neck injury and is in serious condition. One of the backup dancers remains in intensive care after being crushed by the screen, CNN reported.

Members of the audience were also treated for shock, the Washington Post reported.

The concert was immediately stopped and the remaining shows in the band's 12-show concert series have been canceled, Variety reported.

But fans were wary of the production's stage and set: Fans who attended three previous shows started a petition asking concert organizers to ensure the performers' safety as the set seemed unstable.

Over 13,000 people have so far signed the petition that revealed Mirror's rehearsal time was "insufficient" and that there were "questions" around both safety mechanisms and the safety of the band.

"Until yesterday's performance, the entire process had been dangerous, and at the second show, Frankie even crossed the wrong foot and even fell off the stage, making everyone nervous!" the petition reads.

The petition calls on organizers to "ensure the safety of all the performers" and asked to suspend "all use of nonessential mechanisms or stage lifts."

"I believe the audience would rather everyone perform on the ground and not want someone to get injured!" the petition said.

According to CNN, Kevin Yeung, Hong Kong's culture secretary, told reporters that the screen had fallen because one of the cables holding it was loose.

"From initial observation, a wire fractured and led to the fall of the screen and caused the dancers to be injured," Yeung said.

Hong Kong's Labour Department Secretary Chris Sun said Friday he will not rule out legal action against those responsible, CNN reported.

According to Variety, Hong Kong's government is investigating the event and has halted all future shows at the Hong Kong Coliseum until it can be confirmed that the stage and all structures are safe.

Concert organizer MakerVille said in a statement on Facebook that it would cooperate with authorities.