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Associated Press
FILE - This file image made from video broadcast on Syrian State Television on Tuesday, Oct. 8, 2013, purports to show a chemical weapons expert taking samples at a chemical weapons plant at an unknown location in Syria. Two years after President Bashar Assad agreed to destroy his chemical arsenal and joined the Chemical Weapons Convention, activists said they have documented 18 cases of chlorine gas used in the country's rebel-held north since March 6, 2015, when the U.N. issued a resolution determining that chlorine was used in Syria and warning of repercussions. (AP Photo/Syrian State Television via AP video, File)

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