Panic erupted at a packed seaside music festival in northwest Spain when part of a wooden platform suddenly collapsed, injuring more than 300 people, nine of them seriously, officials said Monday.

The seafront platform, measuring 30 metres by 10 metres (100 foot by 30 foot), was jammed with people watching a rap artist in the city of Vigo when part of it collapsed just before midnight on Sunday, mayor Abel Caballero told reporters.

Rescuers armed with an infrared camera combed the site for three hours to ensure no one remained trapped underneath while divers searched offshore, he said.

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“Police got the people out of the area very quickly. There were two people who got trapped by debris, firefighters had to remove them and it was not easy to get them out,” Caballero told Spanish public television TVE.

The president of Vigo’s Port Authority said he thought the structure, built in the 1990s, collapsed due to “excess weight, to overcapacity”.

“That is what seems the most likely cause,” he told TVE but added: “We are going to order an expert study to see what may have happened.”

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