The Islamic State of Iraq and the Levant (ISIL) group has released a video showing 25 Syrian government soldiers being killed by teenagers in the ancient amphitheatre in the city of Palmyra.
The video - published on Saturday - documented a murder that reportedly happened shortly after the group captured the city on May 21.
Al Jazeera chooses not to use any visual material of the victims or the act of violence from the video.
It showed the soldiers in green and brown military uniforms being shot dead on the amphitheatre's stage in front of an enormous version of the group's black and white flag.
The killers all appear to be children or teenagers and are wearing desert camouflage and brown bandanas.