The massacre was held in front of a crowd of spectators.
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YNet News reported:
The Islamic State terror organization has released another propaganda film from the heart of the city Palmyra. The video shows a mass execution of about 25 prisoners, all of whom fought for the Syrian Army.
The execution is carried out while the prisoners kneel in front of the ancient ruins, and is conducted in front of a crowd sitting in the adjacent amphitheater.
The executioners all appear to be children or teenagers and are wearing desert camouflage and brown bandanas.
The killings are carried out in front of a relatively sparse crowd of men and some children watching from the ancient theater’s seats.
IS reportedly carried out more than 200 executions, including of civilians, in and around Palmyra in the period when it captured the city.
— Julie Lenarz (@MsIntervention) July 4, 2015