Damasacus: In an alarming situation, it is now being suspected that the Islamic State used chemical weapons during an attack on Kurds near Irbil city in northern Iraq last month.
While the probe on what chemical agent could have been possibly used is underway, US believes that mustard agent may have been used as at least 60 Kurdish fighters faced breathing difficulties after an attack near Makhmour town last month.
Mustard agent or mustard gas causes blistering of skin, eyes and respiratory tract, the BBC reported.
It is also being feared that the militant group gained access of the mustard agent from the chemical weapons stockpile which was with Syrian government, US officials were quoted in the Wall Street Journal.
This is not the first time when chemical weapons have been used against Kurds in Iraq.
During slain Iraqi leader Saddam Hussain's regime, thousands of people were killed in chemical attack after bombs were dropped in Halabja town in 1998.