Seoul, July 3 (IANS/EFE): Six workers were killed and another was injured in an explosion in a chemical plant in South Korea on Friday, the country's fire department said.
The accident happened when a storage tank containing chemical waste in one of the factories exploded, a fire fighter told the Yonhap news agency.
Fire fighters suspect the explosion occurred when workers were carrying out welding work inside the tank.
The plant, owned by South Korean multinational Hanwa Chemical, is located in the southeastern city of Ulsan, one of the main industrial hubs of the country.
After the incident, authorities said four workers were killed and two others, earlier listed missing, were later confirmed dead.
Authorities will launch an investigation to determine the exact cause of the accident.