Two workers were killed in a rockfall in a coal mine in southern Poland, the operating company PGG said on Tuesday as rescuers searched for another man buried in the incident. The collapse in the mine in Myslowice-Wesola, Silesia, occurred in the early hours of the morning at a depth of 870 metres. There were 15 miners on site at the time. Eleven of them were rescued, while four were initially missing. Rescue teams succeeded in rescuing one injured miner who was then taken to hospital. A short time later, rescuers came across two more miners who were confirmed dead by medical staff on the scen…