Construction by local residents has imperiled an ancient structure, believed to be the tomb of Cyrus I, the Achaemenid king and son of Teispes and grandfather of Cyrus II the Great, near the village of Tang-e Eram in Bushehr Province.

Experts have demarcated a 100-meter perimeter for the site, which was registered on the National Heritage List in 1997, the Persian service of the Mehr News Agency reported on Wednesday.

Any construction done on this perimeter is illegal, however, construction of buildings has increased in the vicinity of the boundary.