Four people were killed and two others suffered cardiac arrest after a fire broke out at a construction site in South Korea's southeastern port city of Busan on Friday, multiple media outlets said.

The fire broke out at about 10:51 a.m. local time (0151 GMT) at a hotel construction site in Busan, some 325 kilometers southeast of the capital Seoul.

The fire was believed to have started from insulation materials loaded near a swimming pool on the first floor.

(With input from Xinhua)