Islamic State militants have blown up the famous Tetrapylon monument and damaged a Roman theatre in Palmyra, in a fresh campaign of destruction after retaking the Syrian city last month.

Satellite imagery, provided by the US-based American Schools of Oriental Research, reveals significant damage to the cubic-shaped Tetrapylon and the 2nd century theatre.

Two columns of the Tetrapylon’s 16 remain standing, but the majority of the structure has been severely damaged and column drums and stone debris are visible on the ground around the structure.

The Tetrapylon, built during the rule of the Roman Emperor Diocletian in the 3rd Century AD, consisted of four sets of four pillars each supporting massive stone cornices.