Suspected gas attack kills dozens in northern Syria

A Syrian man collects samples of possible remnants of toxic chemicals from the site of the attack in Khan Sheikhun.

Syrians bury victims of a suspected toxic gas attack in Khan Sheikhun.

Masks help children injured in the attack breathe at a hospital in Maaret al-Noman.

An unconscious Syrian child is carried in a hospital in the rebel-held town of Khan Sheikhoun following a suspected toxic gas attack on Tuesday.

A Syrian child receives treatment at a hospital in Khan Sheikhun.