British Prime Minister David Cameron say lab tests conducted by the UK confirmed the use of sarin gas in the alleged Syrian chemical weapons attack in August.
Cameron spoke while at the G20 summit in Saint Petersburg,which has been overshadowed by the current crisis in Syria.
Samples collected from the clothes of a victim of the 21 August attack in Damascus that killed hundreds of men, women and children were tested positive at the secret Porton Down laboratories.
Soil at the site of the massacre also contained sarin traces. It means independent British confirmation that one of the cruellest of illegal weapons was unleashed against civilians and opposition fighters.
But Barack Obama’s call for attacks to punish Syrian dictator Bashar al-Assad was jolted when the Pope warned against “futile” military strikes.