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 LONDON, ENGLAND - AUGUST 29: British Prime Minister David Cameron Leaves Downing Street on August 29, 2013 in London, England. Prime Minister David Cameron has recalled Parliament to debate the UK's response to a suspected chemical weapon attack in Syria. (Photo by Dan Kitwood/Getty Images)
 LONDON, ENGLAND - AUGUST 29: British Prime Minister David Cameron Leaves Downing Street on August 29, 2013 in London, England. Prime Minister David Cameron has recalled Parliament to debate the UK's response to a suspected chemical weapon attack in Syria. (Photo by Dan Kitwood/Getty Images)

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Britain: Sarin gas used in Syria

British PM David Cameron tells the BBC soil and clothing samples from Damascus tested positive for the nerve agent.

Britain: Sarin gas used in Syria

British PM David Cameron tells the BBC soil and clothing samples from Damascus tested positive for the nerve agent.