The use of mustard gas was internationally prohibited during the Geneva Protocol in 1925; however, this has not deterred nations from using the chemical agent against civilians and enemy forces.
Most recently, the Islamic State of Iraq and Al-Sham (ISIS) has come under investigation regarding the use of sulfuric mustard in Iraq, marking the first time since the Persian Gulf War that any entity has been accused of using this chemical agent.
According to a recent Reuters article, a source from the Organization for the Prohibition of Chemical Weapons (OPCW) has confirmed that laboratory tests came back “positive” for containing sulfur mustard after nearly 35 soldiers from the Peshmerga Forces were hospitalized in August following a battle with ISIS in northern Iraq.
While the OPCW source could not confirm that ISIS was responsible for the attack, they are the primary suspect.
Reuters further added that the samples were taken after the soldiers became ill during fighting against Islamic State militants southwest of Erbil, capital of Iraq’s autonomous Kurdish region.