At least three university students have died and about 10 others were feared trapped after the roof of a building collapsed, a South Korean official said.
The three students were pronounced dead at hospitals, an official at the state-run National Emergency Management Agency said.
About 1,000 students from Busan University of Foreign Studies were at an orientation event for first-year students in the south-eastern city of Gyeongju, the official said.
About 450 were in a building when its roof collapsed.
He said many managed to get out by themselves and about 20 were later rescued and taken to hospitals. He did not provide further details.