A Syrian rebel group operating around Damascus has executed 18 alleged members of the Islamic State group in a video mimicking the extremist organisation’s own productions.

The video, which emerged overnight, shows fighters from Jaysh al-Islam (Army of Islam) wearing the orange prison clothes that ISIS victims often sport.

The ISIS prisoners however are wearing black clothes and chained together wearing ankle and hand shackles with metal balls attached.

The nearly 20-minute production mimics many aspects of IS’s own execution videos, with similar sound effects and visuals.

Jaysh al-Islam fighters in the video say the IS forces are being executed in part as revenge for the deaths of at least three of the rebel group’s members who were beheaded by ISIS.

Read More: yahoo