Isis jihadists have planted mines around the ancient ruins in Syria's Palmyra, prompting fears for the Unesco World Heritage site.
Militants from Isis (Islamic State) have reportedly carpeted parts of the Roman amphitheatre with bombs and explosives, according to Maamoun Abdulkarim, Syria's antiquities chief.
It was not immediately clear whether the the mines had been lain in preparation for the ruins' destruction, or as a deterrent to forces loyal to Syrian President Bashar al-Assad. The militants seized the strategically important nearby modern town of Tadmur from government forces last month.
The British-based Syrian Observatory for Human Rights, which draws on a network of monitors inside the country, said yesterday that regime forces had brought reinforcements to the west of the city in recent days, possibly in preparation for a fresh assault on the city.