The post-mortems of the victims of the Idlib attack in Syria points to a "possible exposure to Sarin", the Turkish Health Ministry has said.
Sarin is a nerve agent which has no decipherable smell or taste and causes excruciating pain.
At least 86 people were killed in the suspected chemical attack in the northern Syrian town of Khan Sheikhoun, according to the UK-based Syrian Observatory for Human Rights.
The US Secretary of State says president Assad should have "no role" to continue governing after alleged gas attack on his own people.
Survivor of alleged Sarin nerve agent blast says 22 members of his family alone were killed in attack condemned as an "affront to humanity".
A father lost his twin babies, his wife, brothers and other family members in a suspect chemical attack in Syria on Tuesday.