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Not only did the U.S. government fail to provide a single piece of verifiable evidence to support its claims, a much-touted “vector analysis” by Human Rights Watch and the New York Times – supposedly tracing the flight paths of two rockets back to a Syrian military base northwest of Damascus – collapsed when it became clear that only one rocket carried Sarin and its range was less than one-third the distance between the army base and the point of impact. That meant the rocket carrying the Sarin appeared to have originated in rebel territory.
http://consortiumnews.com/2014/04/06/was-turkey-behind-syrian-sarin-attack/