LONDON - Britain has new evidence that chemical weapons were used in an attack on the Syrian capital Damascus, Prime Minister David Cameron said on Thursday.
Cameron said scientists at Britain's Porton Down military research facility had analyzed samples taken from an alleged gas attack on a rebel-held Damascus neighbourhood on August 21 and concluded they had tested positive for the sarin nerve agent.
"We have just been looking at some samples taken from Damascus in the Porton Down laboratory in Britain which further shows the use of chemical weapons in that Damascus suburb," he told BBC TV.
Last week Cameron lost a parliamentary vote backing military action to punish Syrian President Bashar Assad for the reported chemical attack, which Washington says killed more than 1,000 people.
But the British leader denied this had left him on the sidelines of talks at a meeting of the leaders of the Group of 20 (G20) developed and developing economies in Russia.