The international chemical weapons watchdog said Wednesday that chlorine was likely used as a weapon in the rebel-held northern Syrian town of Saraqeb in early February, the latest report of poison gas being unleashed in Syria's civil war.

The OPCW is not mandated to apportion blame for the attack.

The probe into the use of chlorine gas in the Saraqeb attack comes amid the OPCW's investigation into another attack two months later in Douma, near the capital Damascus -- a much larger attack in April that triggered U.S., British and French strikes against government posts in Syria a week later.

OPCW Director-General Ahmet Uzumcu harshly criticized the chemical attack.

The town has before come under suspected chemical attacks, including in 2016 and in 2013 .

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