The US government designated two senior Islamic State figures today, saying they are involved in the group’s chemical weapons program. US officials have previously said that so-called caliphate uses a “mustard agent” in its attacks.

The US-led coalition has killed 13 Islamic State leaders in and around Mosul, Iraq in the past month. Three of them were Chechens, highlighting the important role that foreign fighters play in the group’s chain of command. According to Operation Inherent Resolve spokesman Colonel John Dorrian, another fallen jihadist was responsible for manufacturing chemical weapons to be used in the defense of Mosul.
