Police stand outside a nightclub in Gwangju, South Korea, Saturday, July 27, 2019.

Two South Koreans died and several others, including athletes participating in the World Aquatics Championships, were injured when an upper floor of a nightclub collapsed in the southern city of Gwangju early on Saturday, a fire department official said.

At least 10 people were injured when the structure collapsed on top of revelers around 2 a.m. KST (1700 GMT Friday), pinning people underneath, the Gwangju Fire Department official said.