An injured Kurdish officer is taken for treatment, during a military operation to regain control of some villages from ISIS fighters south of oil-rich city of Kirkuk, 180 miles (290 kilometers) north of Baghdad, Iraq, Wednesday, Aug. 26, 2015.

Islamic State of Iraq and Syria (ISIS) fighters fired mortar rounds containing mustard agent at Kurdish peshmerga fighters in northern Iraq during clashes in August, the Ministry of Peshmerga Affairs said on Wednesday.

Blood samples taken from the approximately 35 Kurdish fighters who were exposed in the attack southwest of the regional capital Erbil, along with an examination of injuries, showed “signatures of sulfur mustard”, the body which oversees the Kurdish armed forces in northern Iraq said in a statement.

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