A world's chemical weapons watchdog raised concerns over reports of a chlorine gas attack near the battleground Syrian city of Aleppo. 
The UN-backed group based in The Hague "continues to examine any credible reports" of chemical weapons use, Ahmet Uzumcu, the head of the Organisation for the Prohibition of Chemical Weapons (OPCW), said in a statement. 
Uzumcu added that under international conventions the use of chemical weapons "by anyone under any circumstances" is seen "as reprehensible and wholly contrary to the legal norms established by the international community."

Source : QNA