>> It was one of the most famous monuments in the ancient city of Palmyra. The Tetrapylon and the facade of it's Roman theater reportedly destroyed by Islamic State. Satellite images sent to Reuters show 4 of 16 columns still standing and the stone platform apparently covered in rubble. The Syrian government lost control of Palmyra to the militant group in December.
The second time they've overrun the UNESCO World Heritage Site in the six year long conflict. Last May, a famous Russian orchestra performed at the theater after Palmyra was won back. The jihadist group has previously destroyed other monuments there, including its 1800 year old monumental arch. The most recent damage has been accompanied by a wave of executions.
IS killed 12 people in the city earlier this. Palmyra, known in Arabic as Tadmor, stood at the crossroads of the ancient world. Experts say, if Islamic State remains in control, further destruction of ancient sites should be expected.