At least two people have died and more than 15 were injured, after an internal balcony collapsed at a nightclub in the South Korean city of Gwangju on July 27, the local fire service says.
According to the South Korean news agency, Yonhap, several athletes at the World Swimming Championships were slightly injured.
The athletes are from New Zealand, Italy, the US, Brazil and the Netherlands.
Two South Koreans were taken to hospital in a serious condition and later died, Yonhap reports.
The deceased were 38 and 27, and were not competitors at the championships.
A balcony and staircase inside the Coyote Ugly nightclub collapsed at 02:29 AM on July 27, while about 370 people were inside.
At the time, several water polo teams were at the club, which is near the athletes’ village.
A male diver and a female water polo player from the US team were slightly hurt.
Members of the Australian water polo team were also in the club.
The 2019 FINA World Swimming Championships end on July 28.
A statement from the world swimming body said: “FINA deeply regrets the situation and sends its best wishes to any victims of this accident.”