Expert doubts dozens rocket could carry enough chlorine to kill one . United Nations affiliate reports results of blood and soil testing sent to CNN . Syria is not one of the 188 signatories to the convention . Sources tell CNN that chlorine mixed with saline was used in attack . Rebels have said they have no access to chemical weapons .
Expert doubts dozens rocket could carry enough chlorine to kill one . United Nations affiliate reports results of blood and soil testing sent to CNN . Sources tell CNN that chlorine mixed with saline was used in attack . Rebels have said they have no access to chemical weapons .