Secretary of the European Department for Security and Information (DESI) Haitham Abu Said said the terrorists regularly use the munitions in their attacks against Syrian civilians.

Abu Said said the ammunition are being supplied to the extremists every month under a plan drawn up in Bulgaria, and sneaked into Syria through the Jordanian border.

He said Nusra Front terrorists have used weapons containing chemical agents against Syrians on a number of occasions, most recently in the strategic northwestern province of Aleppo.

International organizations, he said, have documented several such incidents in the past.

Russian Defense Ministry, meanwhile, said several trucks, carrying improvised chemical weapons, have been transported to Aleppo from neighboring Idlib.

A man receives treatment at a hospital following a Daesh chemical attack in the Sheikh Maqsood neighborhood of Syria’s Aleppo on April 7, 2016

“The arms are said to contain chlorine-based toxins,” the ministry said in a statement.

On May 3, Director General of the Organization for the Prohibition of Chemical Weapons (OPCW) Ahmet Uzumcu said Daesh might have used chemical weapons both in Iraq and Syria.

Uzumcu said fact-finding teams from The Hague-based watchdog had discovered evidence that suggested the use of sulfur mustard in attacks in the two crisis-hit Arab countries.

“Although they could not attribute this to Daesh... there are strong suspicions that they may have used” chemical weapons, Uzumcu said.

On April 7, 23 people were killed and over 100 others injured in a chemical attack by Daesh (ISIS / ISIL) terrorists against members of the Kurdish People's Protection Units (YPG) in Aleppo.

Videos posted online purportedly show yellow gas rising over Sheikh Maqsood neighborhood in Aleppo, some 355 kilometers (220 miles) north of Damascus.

A young man receives treatment at a hospital following a Daesh chemical attack in the Sheikh Maqsood neighborhood of Syria’s northwestern city of Aleppo on April 7, 2016

Syria's al-Ikhbariyah television said Monday that Daesh had fired a barrage of rockets, carrying mustard gas, at a Syrian military airport in the eastern city of Dayr al-Zawr.

According to the Syrian-American Medical Society, Daesh has carried out more than 160 attacks involving “poisonous or asphyxiating agents, such as sarin, chlorine, and mustard gas” since 2011.

At least 1,491 people have been killed in the chemical attacks.

In August 2013, hundreds of people were also killed in a chemical attack in the Ghouta suburb of Damascus. According to reports, the rockets used in the assault were handmade and contained sarin.

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