The collapse of a wooden platform at Spanish music and sports festival O Marisquiño left over 300 people injured on Sunday (8/12), BBC reports. Majorcan rapper Rels B had just begun his set at the Vigo, Spain festival when the accident occured. More from BBC:

According to eyewitnesses, the wooden platform gave way during the first song of the concert as Rels B, who had just started his performance, told the crowd to jump, local media report.

"The floor [of the platform] dropped like a lift. It was a matter of five seconds," Aitana Alonso told a local newspaper . "It broke and we all fell. People fell on me. I had trouble getting out. I was trying to get out and skidded, my foot got stuck, in the water. I got it out. A boy gave me his hand and I got out. I felt paralysed and [then] I left. There was a girl with blood on her head."
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It is not yet clear whether the platform collapsed because there were too many people on it, or because the structure itself was weak, or whether other factors were involved.

There were no known fatalities from the incident, but Xunta Galicia's health department told CNN that nine people were still hospitalized with injuries resulting from the accident.