A rare earthquake that struck South Korea on Wednesday was the second-strongest on record, authorities said. The 5.4 magnitude tremor hit the south-eastern port city of Pohang in the afternoon, and dozens of aftershocks have occurred since.
It has left at least 57 people injured and more than 1,500 homeless.
In an unprecedented step, the education ministry has postponed the nationwide college entrance exam which had been scheduled for Thursday.
South Korean news agency Yonhap said it was the first time a natural disaster had forced a rescheduling of the crucial exam which students and parents spend months preparing for.