Rediff.com takes a look at times these deadly weapons have been used.
The Syrian Observatory for Human Rights had said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms.
The US president said that the 'horrible' chemical attack, which has now claimed over 85 lives, has changed his attitude towards the Syrian President Bashar al-Assad.
Trump said that America's relationship with Russia 'may be at an all-time low', but he hoped that it would have been wonderful if the two countries could get along.
