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A man, affected by what activists say is nerve gas, breathes through an oxygen mask in the Damascus suburbs of Jesreen August 21, 2013. Syrian activists accused President Bashar al-Assad's forces of launching a gas attack that killed nearly 500 people on Wednesday, in what would, if confirmed, be by far the worst reported use of chemical arms in the two-year-old civil war. The Syrian armed forces strongly denied using chemical weapons. Syrian state television said the accusations were fabricated to distract a team of U.N. chemical weapons experts which arrived three days ago. Ammar Dar / Reuters
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