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TORONTO — With a loud rumble that one witness compared to a roller coaster, a stage collapsed Saturday hours before a concert by the alternative rock band Radiohead, killing one person.

”Suddenly, there was a loud crash and it sounded like sheet metal and lightening and we just saw the stage collapse,” said Dusty Lalas, an employee with Toronto radio station The Edge, which was sponsoring the concert.

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“The structure just caved in.”

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

Chris Collins was heading to the show and saw the stage come down from the parking lot at Downsview Park.

“To be honest, it sounded like a roller coaster,” Collins told ABC News. “Basically, like a series of clacking noises and increasing in volume as the collapse proceeded.”

Images showed the roof had collapsed onto the stage. Police and paramedics confirmed one person died, but it was not immediately known precisely how the individual died, nor was the victim’s identity released.