"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," Cameron told BBC TV from the G20 summit in St Petersburg.
A British source told AFP that a soil and cloth sample taken from the site of the alleged chemical attack in the Syrian capital "has tested positive for sarin".
The source said the results were separate to those obtained by the United States, which has said it has proof of the use of sarin in last month's attack.
Last week British lawmakers voted against taking military action against President Bashar al-Assad's regime, which has been blamed for the attack.
The regime claims the rebels were responsible.
US government last week said that as many as 1400 people had been killed, including over 400 children in the August 21 attacks.
However, only United Nations inspectors have been allowed direct access to the sites of the chemical weapons attacks in Damascus. The team returned last week and have sent samples to laboratories for testing with results expected in three weeks times.
UN Secretary General Ban Ki-Moon, in wake of US decision to take military action against Assad, subject to Congressional approval, urged all sides to wait for investigations to be completed.
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Even Turkey caught rebels with chemical weapons. It is the rebel who used it in Bani Walid and now in Syria yet the war mongers are blaming Assad.
Yes we all believe that that poison gas was used. But no concrete evidence who used it.
I'm not a supporter of Assad, but it does not make any sense for him to use chemicals, as he did not look like loosing. It looks much more likely for the rebels to use it, in order to force the west ( after the Obama red line statement) to get involved. No hard evidence has been presented. Cameron and the US saying that evidence of the Assad government's culpability was "growing all the time." We have seen nothing yet.
No one disputes that a chemical attack took place. The question is about the responsibility. US says it is the Syrian government. Russia and Syria say that it is the rebels. UN inspectors have not been charged to fix the responsibility. Your word is as good as mine.
More evidence!! Oh no!! But who done it? Saudi gas supplied by Israel? Or US ??
So while everyone else is on to WHO made the gas attacks, these yokels in government thinks that asserting that the gas was used is somehow the required evidence to bomb and radiate another country into freedom?