Video: Footage shows final moments of children killed in Syrian gas attack

But there is something particularly horrifying about the images in Khan Sheikhoun, something uniquely haunting about watching the last gasps of innocent people. Chemical weapons have been outlawed since the end of World War One. They are barbaric and inhuman, a “red line” that should never be crossed. They also make no distinction between soldiers and children.

There is no mercy, no quick death, no dignity in those last moments. The victims lose control of their faculties, froth at the mouth, and writhe around on the ground as the life drains out of them.