Islamic State is an offshoot of al Qaeda that has seized territory in Syria and Iraq and is the target of a US-led air strike campaign in both countries.

The group has destroyed antiquities in neighbouring Iraq and Syria's antiquities chief has voiced fears it might now devastate Palmyra, home to renowned Roman ruins including temples, colonnades and an amphitheater.

On Wednesday the group shot dead around 20 men in the amphitheater, accusing them of being government supporters, the Syrian Observatory for Human Rights monitoring group said.

The 10 images were published as a photographic report entitled "The ancient city of Tadmur" and showed the inside and entrance to the amphitheater.

Latest News from World News Desk