Islamic State group extremists were likely behind a chemical weapons attack in Syria in 2015, an organisation has said.
![Iran ambulance [Getty]](/sites/default/files/styles/image_156x88/public/media/images/26DFBA8E-D27D-47DB-AA1A-AE32FEA707B6.jpg?h=d1cb525d&itok=JOi3zi1e "Iran ambulance [Getty]")
![Chemical attacks Syria [Getty]](/sites/default/files/styles/image_156x88/public/media/images/3AF320EB-017A-445D-952F-6A37BEC70A6F.jpg?h=d1cb525d&itok=JaRntheL "Chemical attacks Syria [Getty]")
