Soldiers from the Turkish-backed Free Syrian Army (FSA) are showing symptoms of being exposed to chemical gas following a rocket attack by Daesh, said Turkish General Staff in a statement on Sunday.
The attack targeted FSA fighters who have been fighting to liberate the Daesh-controlled town of al-Bab for the past week.
Al-Bab is a major target in Operation Euphrates Shield launched by Ankara in August to push Daesh and YPG away from the Syrian side of the Turkish border.
YPG is a Syrian wing of PKK which is listed as a terrorist organisation by the United States (US), European Union (EU) and Turkey.
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Turkish General Staff said 22 FSA fighters who were observed were showing symptoms of chemical gas exposure in northern Syria’s Khalidiyah region.
The Turkish military also said a clash with Daesh had left one Daesh fighter dead and 14 others injured.
Meanwhile, Turkish warplanes destroyed four Daesh targets in the Anifah neighborhood near al-Bab, also in Syria's north.