Isis uses child soldiers to execute 25 Syrian soldiers at Palmyra's Roman amphitheatre in new execution video.
Isis last week released a video showing teenage children executing 25 captured Syrian soldiers in PalmyraVideo Grab

The Islamic State militants have released a new execution video from Palmyra, which shows Isis child soldiers executing 25 Syrian soldiers shooting them in the head at Tadmur's ancient Roman amphitheatre.

The Isis execution video, which is almost 10-minute long, shows soldiers loyal to Syrian President Bashar al-Assad being put into pickup trucks from the notorious Tadmur prison and then being transported to Palmyra's Roman amphitheatre.

At the amphitheatre a crowd of hundreds of local residents are seen waiting for the execution. The captives are then paraded on the stage and made to stand behind a huge Isis black flag.

The Syrian soldiers are then made to kneel down, while 25 teenaged soldiers, believed to be from Isis cub camps, take positions behind them. The children carrying pistols shoot the soldiers in their head soon after getting the signal from an Isis fighter.

BBC, citing UK-based Syrian Observatory for Human Rights (SOHR), noted that the executions could have been filmed on 27 May as the video ends with destruction of Tadmur prison.

Around the same date, the Isis had released a photo report showing the destruction of the prison.

Syria's antiquities director Mamoun Abdelkarim back in May had told AFP that the killings inside the Palmyra Roman theatre was a sign that soon the militant group would use its "barbarism and savagery against the ancient monuments of Palmyra" as well.

"Using the Roman theatre to execute people proves that these people are against humanity," he had told the AFP news agency.

The Greco-Roman ruins at Palmyra are listed as a UNESCO World Heritage Site and the capture of the city by the Isis has triggered international concerns over the fate of its ancient treasures.

The Sunni militant group recently published a series of pictures from Homs, where its fighters are shown destroying dozens of statues claimed to have been stolen from Palmyra by smugglers, who wanted to sell it out of the country.