One person is in hospital with serious injuries and more injuries reported

A stage technician was killed and at least three people were seriously injured after a stage collapsed at Toronto's Downsview Park just hours before Radiohead was to take the stage, according to a CBC report.

The stage was set up for a Radiohead concert for the North by Northeast music festival Saturday night. The concert has been cancelled and ticket holders are were asked not to go to the park via Twitter.

No band members were believed to be on stage at the time of the collapse, but concert crew were working on the stage when it collapsed shortly after 4 p.m.

Radiohead cancelled their performance. "Due to unforeseen circumstances, the Radiohead show at Downsview Park tonight has been cancelled," the band said in a message on its website. "Fans are advised not to make their way to the venue."

The collapse occurred as thousands of fans were already lining up outside.

The collapse is the most recent in a string of incidents at Canadian concerts over the past several years. Last year at Ottawa's Bluesfest, the stage collapsed during a Cheap Trick performance, injuring three. In 2009, the main stage collapsed at the Big Valley Jamboree in Camrose, Alta. One person was killed and 15 were injured.