Experts are increasingly confident that a powerful nerve agent was used to kill and injure victims in an attack on a rebel-held region of Syria on Tuesday. More than 70 people were killed in a bombing in Idlib province, according to the Syrian Observatory for Human Rights. The organization says that the death toll so far includes 20 children. Elsewhere in the province, more than 30 people were reported killed in conventional attacks. In a separate statement , Doctors Without Borders said one of its teams had examined eight survivors of the attack who had exhibited symptoms of exposure to "a neurotoxic agent such as sarin" — including constricted pupils and muscle spasms. Those symptoms are consistent with "any one of the chemicals in that chemical family of nerve agents," agrees Dan Kaszeta , a chemical weapons expert with Strongpoint Security, a London-based consultancy. Kaszeta says it's the strongest evidence of an attack using nerve agent since an August 2013 strike on a Damascus
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