The ANSA news agency reported that a seventh steelworker died on Sunday from serious burns sustained in a fire more than three weeks ago at German steelmaker ThyssenKrupp's Turin based mill in northern Italy. He was the last injured worker still undergoing treatment.

The fire was reportedly sparked when a burst pipe spilled oil onto molten steel. Workers reportedly said the plant's fire extinguishers were empty and the emergency telephone was not working.

Prosecutors have opened a probe into the causes of the fire, with workers describing slack safety measures to investigators.

The accident triggered a huge emotional reaction in Italy.