The White House on Thursday said it suspected that Syrian forces loyal to President Bashar Al-assad had used nerve gas on a small scale in their continuing battle with anti-government forces.
According to Reuters, "U.S. officials said the intelligence community believed with "varying degrees of confidence" that the chemical nerve agent sarin was used by Assad's forces against rebel fighters. However, it noted that "the chain of custody is not clear."
The White House said the evaluation that Syria probably used chemical weapons was based in part on physiological samples, but a U.S. official declined to say what kind of evidence it had, like soil samples or blood or hair from victims.
The scale of the use of sarin appeared limited, with one U.S. intelligence official noting that nobody was "seeing any mass casualties" from the possible use of chemical weapons in Syria.
Sarin gas is a nerve agent that is deadly even in small concentrations. Sarin interrupts synaptic activity resulting in paralysis and eventually death.

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