The incident took place in Mosul Iraq where around 145 militants had gathered for the Iftar meal.
A spokesman for the Kurdish Democratic Party said only 100 ISIS militants walked away alive and it is yet not clear whether the militants were deliberately poisoned or they suffered from food poisoning.
Mosul is the largest city in the group’s self-declared caliphate and was captured by ISIS militants in June last year.
This comes as several ISIS militants were killed in a similar incident in Syria last year after Free Syrian Army militants infiltrated their base and poisoned their lunches.
Around 1,200 ISIS militants were reportedly stationed in the camp when Free Syrian Army poisoned their food while posing as chefs.
In the meantime, images have emerged throughout Ramadan showing ISIS extremists sitting down to lavish meals while those living under its brutal regime starve, according to the MailOnline.
Undercover footage from the terror group’s adopted capital of Raqqa in Syria showed hundreds of young boys and burqa-clad women queuing for food and water in the blistering heat.
It was shared by anti-ISIS activists Raqqa Is Being Slaughtered Silently alongside the caption, ‘the second day of Ramadan’ – the holy month when Muslims do not eat or drink from dawn until the sun has set.