U.N. chemical weapons experts wearing gas masks carry samples from one of the sites of an alleged chemical weapons attack in the Ain Tarma neighbourhood of Damascus August 28, 2013. U.N. chemical weapons experts investigating an apparent gas attack that killed hundreds of civilians in rebel-held suburbs of Damascus made a second trip across the front line to take samples. REUTERS/Mohamed Abdullah (SYRIA – Tags: – Tags: POLITICS CONFLICT TPX IMAGES OF THE DAY MEDIA) – RTX12Z2V

U.N. chemical weapons experts wearing gas masks carry samples from one of the sites of an alleged chemical weapons attack in the Ain Tarma neighbourhood of Damascus August 28, 2013. U.N. chemical weapons experts investigating an apparent gas attack that killed hundreds of civilians in rebel-held suburbs of Damascus made a second trip across the front line to take samples. REUTERS/Mohamed Abdullah (SYRIA – Tags: – Tags: POLITICS CONFLICT TPX IMAGES OF THE DAY MEDIA) – RTX12Z2V

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