Intercepted Calls Prove Syrian Army Used Nerve Gas, U.S. Spies Say

American intelligence analysts are certain that chemical weapons were used on Aug. 21 -- the captured phone calls, combined with local doctors' accounts and video documentation of the tragedy -- are considered proof positive. That is why the U.S. government, from the president on down, has been unequivocal in its declarations that the Syrian military gassed thousands of civilians in the East Ghouta region.