Two South Koreans were killed, Yonhap reported, citing the Gwangju Fire and Safety Headquarters. Among the 17 injured were nine foreign athletes, including four Americans, two New Zealanders, one Dutch, one Italian and one Brazilian, fighters told Yonhap. Their injuries were not severe, Yonhap reported.
The internal structure collapsed around 2:39 am local time, according to a tweet by the South Korean Ministry of Public Administration and Security.
"Currently, police and fire departments are investigating the exact cause of the accident," the agency said.
Authorities are investigating whether loft collapsed due to weight, Yonhap reported. Witnesses told the news agency there were about 1
Gwangju, about 268 kilometers (167 miles) south of Seoul, is hosting the 2019 International Swimming Federation (FINA) World Championships, which includes swimming, water polo, diving, The accident comes just a day before the championships draw to a close, as the city is teeming with hundreds of athletes from across the globe.
FINA said it was monitoring the situation.
"As some Championships' attendees were present at the time of the accident, FINA is carefully monitoring the situation and will activate all measures to ensure health care and assistance is provided whenever necessary," FINA said in a statement.  This OTHER Dominant US Women's National Team just made history ” data-src-mini=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-small-169.jpg” data-src-xsmall=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-medium-plus-169.jpg” data-src-small=”http://cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-large-169.jpg” data-src-medium=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-exlarge-169.jpg” data-src-large=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-super-169.jpg” data-src-full16x9=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-full-169.jpg” data-src-mini1x1=”//cdn.cnn.com/cnnnext/dam/assets/190726161429-04-us-womens-water-polo-small-11.jpg” data-demand-load=”not-loaded” data-eq-pts=”mini: 0, xsmall: 221, small: 308, medium: 461, large: 781″ src=”data:image/gif;base64,R0lGODlhEAAJAJEAAAAAAP///////wAAACH5BAEAAAIALAAAAAAQAAkAAAIKlI+py+0Po5yUFQA7″/>
The USA Water Polo Team said in an earlier statement all American athletes were safe and accounted for.