The Islamic State group used poison gas in attacks against Kurdish-controlled areas of northeastern Syria in late June, a Syrian Kurdish militia and a group monitoring the Syrian conflict said Saturday.
Two U.K.-based organizations investigating the attack said they had confirmed Islamic State's use of chemical weapons against Kurdish forces and civilian targets in Syria and Iraq, where they said chemical agents were also used in an attack on an Iraqi Kurdish peshmerga position on June 21 or 22.
Kurdish forces are playing a vital role in the fight against Islamic State in both Syria and Iraq. The ultra-radical group has seized wide areas of both countries, declaring them part of a cross-border "caliphate" claiming to rule all Muslims.