Syria 'chemical' attack: what we know

International outrage is mounting over a suspected chemical attack that killed scores of civilians in a rebel-held town in northwest Syria on Tuesday morning. AFP's correspondent in the town of Khan Sheikhun saw lifeless bodies lying at a field hospital, which was itself hit in air strikes hours after the attack. It remains unclear what kind of substance was used in the attack, but the World Health Organization said on Wednesday that some victims appeared to show signs of exposure to "nerve agents".
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