Tied to an iron pole in Tal Afar Square in the Iraqi city of Mosul, the youths were sawn to death as onlookers watched on, a source told Iraqi News on Wednesday.
Public executions using chainsaws mark another sickening low for ISIS.
An ISIS executioner – called The Bulldozer – was captured on camera in June carrying out public executions.
The world was shocked when pictures of him beheading a boy for listening to Western songs on a personal music player emerged earlier this year.
Monstrous fighters belonging to the death cult – also known as Daesh – have executed thousands of Mosul’s citizens since ISIS took control of the city in 2014.
The news of ISIS’ latest execution method comes after ISIS forced Mosul’s citizens to watch as six men were boiled alive in tar last month.
Gay men have been routinely thrown off buildings by ISIS savages while some prisoners have even been dissolved to their deaths using nitric acid.