A balcony inside a nightclub in South Korea collapsed on Saturday, killing two people and injuring 16, including American and other athletes at the world swimming championships, officials said.

Hundreds were at the nightclub in the southern city of Gwangju when the collapse occurred next to the athletes’ village.

Two South Korean men died while 16 others were injured, police said. According to a police account, the injured include 10 foreigners, eight of them athletes who were in Gwangju to participate in the swimming championships.

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Among the athletes were three Americans, two New Zealanders, one Dutch, one Italian and one Brazilian, a police officer said, requesting anonymity ahead of an official announcement. He said most had minor injuries but an American female water polo player required surgery. The other two Americans, a man and a woman, are also water polo players, the police officer said.

Police said they detained one of the nightclub’s co-owners and summoned three other club officials to investigate whether the collapsed balcony was an unauthorized structure.

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