The accident occurred in the Oranovo coal mine near the town of Simitli, 110 kilometers (70 miles) south of Sofia. Officials said torrential rains over the past few days may have caused the collapse. The two miners were trapped 300 meters (yards) underground. They were taken to hospital in critical condition but died later of their injuries.
It was the second serious accident this year in the same coal mine. In March, two miners died and another seven were severely injured in an explosion caused by the ignition of a methane gas buildup.
Russian Foreign Minister Sergei Lavrov said at a briefing in Beijing that the question about the shipment of S-300 anti-aircraft missile systems to Syria had not been resolved yet. However, Syrian Ambassador to Russia Riyad Haddad said that S-300 missile systems had been delivered to Syria last month