Radiohead cancelled a concert in Canada after one person died and another was seriously injured when the stage collapsed during setting up.
Two other people were also injured on Saturday, paramedics said.
The Oxfordshire band had been due to play to a sold-out crowd at Downsview Park in Toronto.
A statement on the band's website said:
Toronto Police posted on their official Twitter page: "#Radiohead concert at #Downsview Park has been cancelled due to stage collapse. Asking people to stay away from immediate area."
Within minutes of news spreading the hashtag #radiohead was the top trending topic on the social network website.
In one picture posted on Twitter by Jason Ip, a huge scaffolding that had fully collapsed in the middle could be seen.
Along with the picture Mr Ip tweeted: "Radiohead stage collapse. People were underneath and we're getting sent away from the site."
Representatives for the concert's promotion company, Live Nation, were not immediately available for comment on the incident.
Downview Park officials confirmed that the Radiohead concert had been cancelled as a result.
A Toronto police spokesman said an unknown number of people near the stage at the time were injured and taken to the hospital.
Rehearsals and sound checks were being conducted at the venue when the collapse occurred, but the headline band Radiohead was not on stage at the time, Toronto police confirmed, adding that investigators were still unsure what caused the collapse.
Radiohead, an alternative rock group led by singer Thom Yorke and famed for such hits as "Creep" and "Paranoid Android," is on an international tour this summer.