The Syrian news agency SANA earlier reported citing hospital medics that the Turkish forces had used chemical weapons amid its ongoing anti-Kurdish campaign in Syria's Afrin.
The Organization for the Prohibition of Chemical Weapons (OPCW) has not found evidence of the possible use of chemical weapons by Turkey in Syrian Afrin, the organization's head, Ahmed Uzumcu, told journalists on Tuesday.
Earlier, the Syrian state agency SANA, citing the director of Afrin's hospital, Joanna Mohamada, reported that the Turkish military used poisonous substances in the Syrian enclave of Afrin and six people were hospitalized with symptoms of suffocation.
In January, Turkey jointly with the opposition Free Syrian Army forces, launched Operation Olive Branch in Afrin in order to "clear" its border with Syria from terrorists. Turkey considers the Democratic Union Party (PYD), a Kurdish political party in northern Syria, and the Kurdish People's Protection Units (YPG) militia to be linked to the Kurdistan Workers' Party (PKK), listed as a terrorist organization by Ankara.
Damascus has condemned the operation as a violation of Syria's sovereignty.