Stage collapses at music icon's afternoon show in Toronto's Downsview Park leaving one dead and at least three others critically injured.

Emergency crews were alerted around 4 p.m. ET yesterday evening, June 16, that an accident had occurred during Radiohead's concert at the outside venue.

Officials and paramedics arrived shortly after and cleared the crowd waiting for the show.

Of the 40,000 present, only a hand full were transported to Sunnybrook Hospital for both serious and minor injury treatment.

Naturally, the accident left tonight's show cancelled. The band later warned fans to stray away from the venue for the 7:30 p.m. sold-out performance through their official Twitter feed.