Archaeologists in Szombathely, W Hungary excavated a number of graves from the late Roman era while exploring the ground where an extension to the local concert hall will be built, a spokesperson of the local Savaria Museum's archaeology team said on Wednesday.

A total of twenty graves, dating from the third century were found, along with the remains of a Roman sewage system, Peter Kiss said.

The bones in the graves were scattered about, suggesting raids by grave robbers in later ages, he added.

The area around the concert hall was known to contain ancient artefacts because there had been test digs in the 1960s when the music school was built, Kiss said.