"Yes, and it has been used. It is proven by documents. The wounded were treated in Germany from chemical weapons [wounds]. It is possible that they can use it when they feel threatened," Hoshawi Babakr told RIA Novosti.
On Sunday, Iraqi Prime Minister Haider Abadi announced the start of the military operation to retake Mosul from Daesh terrorist group.
According to local media, about 30,000 Iraqi soldiers and 4,000 Kurdish Peshmerga fighters are taking part in the Mosul operation, backed by artillery and airstrikes carried out by the US-led international coalition against the terrorist group.