“There is a growing belief within the US government that the Islamic State militant group is making and using crude chemical weapons in Iraq and Syria, a US official has told the BBC”.
“The US has identified at least four occasions on both sides of the Iraq-Syria border where IS has used mustard agents, the official said.”
“The official said the chemical was being used in powder form. A BBC team on the Turkey-Syria border has seen evidence backing these claims.”

“The US believes the group has a cell dedicated to building these weapons. “They’re using mustard,” the individual said of IS. “We know they are.” (Coordination Center)

Since FEB 2015 NEC-SE has been warning of the possible use of these chemicals in the region.  Unfortunately our assessments and analysis has been on target.  KRG and the Iraqi forces are responsible for securing their administered areas.

http://www.bbc.com/news/world-us-canada-34211838