France says it has evidence showing the Syrian air force “undoubtedly” dropped bombs containing the nerve agent Sarin on a rebel-held town last month.
Foreign Minister Jean-Marc Ayrault told reporters that samples taken from the scene bore the “signature” of Sarin produced by Syria’s government.
At least 87 people were killed in the incident in Khan Sheikhoun, according to an opposition-run health authority.
Syrian President Bashar al-Assad has dismissed it as a “fabrication”.
He insists the government has never used chemical weapons and that it turned over all of its stocks in 2013, after it was blamed by Western powers for a Sarin attack on rebel-held suburbs of Damascus that left hundreds dead.
