The incident occurred early Thursday at Dzhurkovo near the town of Luki, 200 kilometers (125 miles) southeast of Sofia, local mayor Krasimir Manov said.
Details of the accident were not immediately clear, but media reports said the miners were killed in a mine collapse followed by a gas blast.
The two injured miners were taken to a nearby hospital
It was the third mine accident in Bulgaria this year. Four miners died and seven were seriously injured in two separate accidents at a coal mine in the southern part of the country.
Representatives of the Israeli Defence Ministry responded to recent reports about the possible delivery of S-300 SAM systems from Russia to Syria. Israeli Defence Minister Avigdor Lieberman said that Israel would destroy those systems
Russia is to start supplying S-300 air defence systems to Syria in the near future. The shipments will be conducted free of charge