Description of attack in which six rebels died adds to uncertainty about claims that sarin has been used in the conflict Peter Beaumont / The Observer, Saturday 27 April 2013 23.01 BST
Shelling in Houla in Syria’s Homs province. Rebel forces have accused the regime of using chemical weapons. Photograph: Jalal Al-Halabi/AFP/Getty Images
New questions have emerged over the source of the soil and other samples from Syria which, it is claimed, have tested positive for the nerve agent sarin, amid apparent inconsistencies between eyewitness accounts describing one of the attacks and textbook descriptions of the weapon.
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Lucas 2012 Infos 
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