US outlines evidenceTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoMichael Fechner09/02/2013September 2, 2013US Secretary of State John Kerry said samples obtained by the US reveal Sarin was used in the August 21 attack in Damascus. US President Barack Obama is seeking congressional approval for military intervention.https://p.dw.com/p/19Zq8Advertisement