Bulgarian archaeologists had excavated a Thracian tomb in the south-eastern Bulgarian municipality of Tsarevo, Focus news agency said.
The tomb had a semi-cylindrical arch. Tombs of this type had never before been discovered in the Strandzja mountains, according to archaeologist Daniela Agre.
The tomb had been partially destroyed, presumably by treasure hunters, Agre said. Agre called for amendments to the law and tougher sanctions on treasure hunting, Focus news agency said.
The tomb was made of white soft limestone and dated to 370-360 BCE.