In this image taken from video obtained from the Shaam News Network, posted on April 16, 2014, an anti-Bashar Assad activist group, which has been authenticated based on its contents and other AP reporting, children are seen receiving oxygen in Kfar Zeita, a rebel-held village in Hama province some 200 kilometers (125 miles) north of Damascus. Syrian opposition activists and other witnesses tell The Associated Press that Syrian government forces have attacked rebel-held areas with poisonous chlorine gas in recent months. They say the attacks left scores of men, women and children coughing, choking and gasping for breath. The reports have been denied by the Syrian government and have yet to be confirmed by any foreign country or international organization. But if true, they highlight the limitations of the global effort to rid Syria of its chemical weapons. (AP Photo/Shaam News Network)
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