In South Korea, an explosion at a shipyard owned by STX Offshore and Shipbuilding killed four workers today. The country's fire department did not give the cause of the blast. Korean media reports said a tank exploded in a under construction ship. An official from the National Fire Agency said, the four men, aged in their 30s to 50s, were painting the ship in the yard in Jinhae, an industrial hub on the country's southeast coast. No additional injuries were reported, the official said.