A shocking video uploaded on Friday by anti-violence campaigners, showed the execution of four men.
They were thrown off the roof of a building, during which screams were heard by the crowd of hundreds gathered to watch.
The corpses of the men were seen piled up on the ground at the execution which took place in the city of Seir ez-Zor.
Pictures and videos of the victims, who were suspected by ISIS of homosexuality, were uploaded by @Raqqa_Sl, which campaigns against violence in Syria.
Some tweets even used the #LoveWins hashtag synonymous with the SCOTUS ruling, to tweet messages about the victims.
At time of publication the YouTube video of the execution had been removed.
The group known as Islamic State has reportedly been employing “honeytraps” to coerce men into homosexuality before executing them.
Members of the terrorist group, which has published a number of graphic videos featuring the murder of supposed gay men, holds power across parts of Iraq, Syria and Libya.
ISIS militants recently threatened to throw homosexuals off the Leaning Tower of “Pizza”.
Members of ISIS took to Twitter to warn that they were coming to “Rome” to “use your leaning tower of pizza to throw off homosexuals”.
The Leaning Tower of Pisa – which is not spelled Pizza – is actually located in the town of Pisa, nearly 200 miles from Rome.