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Chemical-Attack Scientists Seek Evidence in Blood: Health

United Nations investigators embarked on a hunt of everything from bomb craters to blood samples for evidence of chemical weapons in Syria, even as officials from the U.S. and U.K. said it was indisputable the agents had been used.

Video footage of the aftermath of a suspected chemical attack Aug. 21 on the Damascus suburb of Ghouta shows people with symptoms such as narrowing of the pupils, excessive salivation and convulsions that point to exposure to sarin or another nerve agent, according to a weapons expert.