(CNN)International chemical weapons inspectors have confirmed that the nerve agent sarin was used in April’s deadly chemical attack in Syria’s Idlib province.

The Organisation for the Prohibition of Chemical Weapons (OPCW) launched an investigation after the April 4 airstrike on the rebel-held town of Khan Sheikhoun, where horrifying images and videos emerged showing civilians — including children — struggling to breathe with foam coming from their mouths. Continue reading.