Head of the Iraqi Turkmen Front, Arshad Salihi, said in a statement on Friday that the extremists lobbed a barrage of mortar rounds, which contained chemical agents, on the town of Tuz Khurmatu, situated 25 kilometers (15.5 miles) south of oil-rich city of Kirkuk, on March 9.

“Daesh has materials to produce these kinds of prohibited weapons [...] and has also experts to produce these weapons,” Salihi said.

Director General of the Organization for the Prohibition of Chemical Weapons (OPCW) Ahmet Uzumcu said on Tuesday that fact-finding teams from The Hague-based watchdog have discovered evidence suggesting the use of sulphur mustard in ISIS attacks against areas in Iraq and neighboring Syria.

“Although they could not attribute this to Daesh... there are strong suspicions that they may have used it (chemical weapons),” Uzumcu said.

“Secondly, the suspicions are that they may have produced it themselves, which is extremely worrying,” he pointed out.

He further said “it proves that they have the technology, know-how and also access to the materials which might be used for the production of chemical weapons.”

On April 7, 23 people were killed and over 100 others injured in a chemical attack by Daesh terrorists against members of the Kurdish People’s Protection Units (YPG) in a neighborhood of the northwestern Syrian city of Aleppo.

Videos posted online purportedly showed yellow gas rising over Sheikh Maqsood neighborhood in Aleppo, located some 355 kilometers (220 miles) north of the capital, Damascus.

According to a report by the Syrian-American Medical Society, ISIS has carried out more than 160 attacks involving “poisonous or asphyxiating agents, such as sarin, chlorine, and mustard gas” since the beginning of the Syrian conflict in 2011. At least 1,491 people have been killed in the chemical attacks, Press TV reported.

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