The U.S. military is trying to determine what chemical the Islamic State group used against Iraqi government forces last weekend, the commander of anti-IS coalition ground forces said Wednesday.
Maj. Gen. Joseph Martin told reporters via video link from Baghdad that Iraqi forces were treated after a strike in western Mosul. He said no one was "significantly impacted."
The Organization for the Prohibition of Chemical Weapons has said IS militants previously have used sulfur mustard gas. Wilson said that in the past, IS has demonstrated a "low-grade capability" with chemical weapons.