Five workers were killed and 11 injured on Thursday when a storage tank exploded at a chemical plant in South Korea

Five workers were killed and 11 injured on Thursday when a storage tank exploded at a chemical plant in South Korea, firefighters said.
  
The tank, containing inflammable material, exploded around 19:00 (1200 GMT) at a Daelim Industrial plant in the southern coastal city of Yeosu. "It did not start a fire and an investigation is under way," a firefighter told AFP.
  
Yonhap news agency said the workers had been engaged in welding when the tank storing the plastic polyethylene exploded.