The stage at Downsview Park in Toronto collapsed this afternoon just hours before Radiohead were scheduled to play to a sold-out crowd, CBC News reports.
The band was not onstage at the time, but one person was killed and three others were injured in the collapse. The concert, whose gates were scheduled to open at 5 p.m., has been cancelled.
Toronto fire captain Mike Strapko told CNN that a "scaffolding-type structure collapsed" some 40 to 60 feet above the main stage area as the victims were setting up for the concert around 4 p.m. There were no strong winds or other dangerous weather conditions at the time.
A statement on Radiohead's website says that tickets will be refunded, and advises fans not to make their way to the venue.
The accident comes after a number of recent stage collapses at high profile shows raised concerns about safety at concerts. Seven people were killed at the Indiana State Fair last August when high winds knocked down scaffolding and speakers, and just last Saturday, the Electric Daisy Carnival in Las Vegas was shut down by windstorms, forcing the cancellation of some headlining sets.