BERLIN, Oct. 1 (Xinhua) -- Three miners were killed after a gas outburst in a potassium mine in central Germany on Tuesday.
Rescuers found bodies of the three in the mine deep underground in Unterbreizbach in the state of Thuringia, K + S GmbH, the mine operator, said on Tuesday night.
According to the Kasel-based company, an unusually massive amount of carbon dioxide escaped after an "everyday" detonation for salt extraction in the potassium mine at around 13:00 (1100 GMT), carrying a huge cloud of dust through the shafts to the surface of the ground.
Seven people were initially trapped about 700 meters underground. Four of them were rescued without injuries later.
"My sympathy goes to the families of the three miners who lost their lives today," said Christine Lieberknecht, Minister President of Thuringia, thanking all the emergency services involved in the rescue.
After the accident, areas near the mine were evacuated and a federal road nearby was also closed as a precaution.