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After recapturing the site in late 2016, militants destroyed the tetrapylon - a group of four pillared structures - and part of the Roman Theatre.

The sites include the Unesco World Heritage site of Palmyra, where IS militants blew up the 2,000-year-old Temple of Bel, the tetrapylon - a stone platform supported by four columns - and part of a theatre.

It destroyed parts of the Tetrapylon, a monument marking a bend in the ancient colonnade, and the facade of the second-century Roman Theater before it was driven from the city in March this year.

It destroyed parts of the Tetrapylon, a monument marking a bend in the ancient colonnade, and the facade of the second-century Roman Theater before it was driven from the city in March this year.

This time, the militants set off explosions at the awe-inspiring Tetrapylon, four pillars on a raised platform that embodied the grandeur during the celebrated reign of Queen Zenobia, the cultivated monarch of the 3rd century.