The jihadists could be seen clearing a road through the berm, before trucks drove through as a militant stood nearby holding the group’s black flag, in photos shared on websites and Twitter.

Creating a cross-border Islamic state is one of the group’s main aims.

The first shot was dated June 10 and carried the title of the photo series, “Smashing the Sykes-Picot border” — a reference to the agreement between Britain and France that carved up the Middle East after World War I, with the former taking Iraq and the latter Syria.