Syria: France says there is 'no doubt' Assad regime used sarin gas

France has said it has proof that President Bashar al-Assad's regime has used the deadly nerve agent sarin gas in Syria's civil war, adding that "all options," including armed intervention, are on the table.

French Foreign Minister Laurent Fabius told France 2 television: "We have no doubt that the gas is being used. The conclusion of the laboratory is clear: there is sarin gas."

Experts had analysed samples brought back from Syria, he said.

Earlier, his ministry released a statement from Fabius in which he said "France is now certain that sarin gas has been used in Syria several times and in a localised fashion".

Although the statement did not say who had used the gas, it added: "It would be unacceptable that those guilty of these crimes could benefit from impunity."

Later, in his televised remarks, Mr Fabius went further, saying that in at least one case, there was "no doubt that it was the regime and its accomplices