The Syrian government’s chemical weapons stockpile has been linked for the first time by laboratory tests to the largest sarin nerve agent attack of the civil war, diplomats and scientists told Reuters, supporting Western claims that government forces under President Bashar al-Assad were behind the atrocity.

Laboratories working for the Organisation for the Prohibition of Chemical Weapons compared samples taken by a U.N. mission in the Damascus suburb of Ghouta after the Aug. 21, 2013 attack, when hundreds of civilians died of sarin gas poisoning, to chemicals handed over by Damascus for destruction in 2014. Continue reading.