FILE - This image made from an AP video posted on Wednesday, Sept. 18, 2013 shows shows Syrians in protective suits and gas masks conducting a drill on how to treat casualties of a chemical weapons attack in Aleppo, Syria. The Islamic State group is aggressively pursuing development of chemical weapons, setting up a branch dedicated to research and experiments with the help of scientists from Iraq, Syria and elsewhere in the region, according to Iraqi and U.S. intelligence officials. (AP Photo via AP video, File)
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