The parents of the dancer who was seriously injured at Thursday's MIRROR concert arrived in Hong Kong on Sunday morning from Toronto, according to the legislator who represents the performing arts sector, Kenneth Fok.

The dancer, Lee Kai-yin, was hit on the head by a falling giant video screen. He is said to be in critical condition in Queen Elizabeth Hospital after surgery on Friday, though his vital signs are reported to be stable.

Officials had said they would make every effort to ensure that the parents could visit him soon after their arrival, even though they are subject to hotel quarantine.

Fok also said he hoped the government could conclude its investigation into the incident at the Hong Kong Coliseum more quickly, after officials said the work could take up to eight weeks.

He was also asked to comment on remarks by Culture Secretary Kevin Yeung, who said events at government-owned venues such as the Coliseum would be allowed go ahead if the set design was relatively static.

Fok said he wouldn't comment on what should or shouldn't be allowed in a concert, adding that he and other members of the industry will meet with the government to reflect their views.

The legislator added that he hadn't heard of any upcoming concerts being cancelled.

Meanwhile, the contractor responsible for stage works at the MIRROR concert, Engineering Impact, released a statement overnight, saying many parties were involved in the production, from brainstorming and design to installations and operations.

It said the company was cooperating with authorities as well as the organisers to find out what went wrong and would not comment on the incident for now to avoid speculations and misunderstanding.

Separately, the police said the West Kowloon regional crime unit had taken over the investigation into the incident.