BARCELONA, Spain (CBS) — A stage went up in flames at a music festival as a crowd of 22,000 concertgoers were dancing in Barcelona at Parc de Can Zam.

Spain’s Globo is reporting the cause of the fire to be on-stage fireworks.

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Organizers blame the fire on a technical malfunction.

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The Tomorrowland Unite Festival was being streamed from Belgium.

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Spanish authorities say all 22,000 people were evacuated from the park without injury, though several people were treated for anxiety.