A video apparently released by the Islamic State group shows 25 men being shot dead in the ancient city of Palmyra, in Syria.
According to BBC, IS said the men were soldiers captured in the city of Homs. They were shot dead inside Palmyra's amphitheatre.
Stills from the video showed the killers to be young males, possibly even as young as 13 or 14.
IS captured Palmyra and the neighbouring modern city, locally known as Tadmur, in late May.
The video was distributed by accounts known to be linked with Islamic State militants. It is not clear when it was filmed.
The killings took place on a stage in the amphitheatre in front of a large black IS flag.