Experts from the world's watchdog tasked with destroying chemical weapons are probing reports that toxic arms have been used 45 times in Syria since late last year, the body's chief said Friday (April 28th).

Director general Ahmet Uzumcu said there was "a huge list of allegations" of the use of toxic arms reported to the operations hub of the Organisation for the Prohibition of Chemical Weapons (OPCW), AFP reported.

In the "second part of 2016, 30 different incidents, and since the beginning of this year, 15 separate incidents, so 45," he said.

They include the April 4th sarin gas attack on the town of Khan Sheikhun that was reported to have killed 88 people, including 31 children.

"All these allegations are recorded by our experts, who follow this every day from our operations centre," Uzumcu said.

Uzumcu also confirmed that the OPCW believed extremists from the "Islamic State of Iraq and the Levant" (ISIL) had used "sulphur mustard" near Iraq's Mosul last week.

The Iraqi military said some security personnel were injured in the April 15th attack as part of the operation to recapture Mosul.