Syria

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A Syrian boy sits Tuesday amid the rubble of a house in Taftanaz, Syria, that was destroyed during a military operation by the Syrian army in April. Damascus has agreed to allow humanitarian-aid workers from the U.N. and nongovernmental organizations into four Syrian provinces to deliver food, medicine and other supplies. (Associated Press)

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Relatives of Free Syrian Army soldier Moayad Ghafir, who was killed during clashes with regime gunmen, mourn over his dead body before his funeral in his family's home on the outskirts of Idlib, Syria, on Monday, June 4, 2012. (AP Photo)

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Syrian President Bashar Assad delivers a speech in Damascus on Sunday. He denied responsibility for the massacre in Houla last month. (Associated Press)

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Syrian President Bashar Assad speaks to parliament in Damascus, Syria, on Sunday, June 3, 2012. (AP Photo/SANA)

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** FILE ** In this image made from amateur video released by Ugarit News and accessed Saturday, May 5, 2012, a U.N. observer, right, inspects what residents of the town of Taftanaz, Syria, tell him is a mass grave. The Associated Press cannot independently verify the content, date, location or authenticity of this material. (AP Photo/Ugarit News via AP video)

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**FILE** Syrian security forces (in background) hold their machine guns and surround anti-Syrian regime mourners April 30, 2012, during the funeral procession in Damascus, Syria, for the activist Nour al-Zahraa, 23, who was shot by the Syrian security forces. (Associated Press)

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Kofi Annan, the U.N.-Arab League Joint Special Envoy for Syria, speaks June 1, 2012, during a press conference after his meeting with Lebanese Prime Minister Najib Mikati at the governmental palace in Beirut. (Associated Press)

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In this citizen journalism image taken on May 29, 2012, and provided by Edlib News Network ENN, a Syrian girl sits atop of a U.N. observers vehicle during a demonstration in Kfarnebel, Idlib province in northern Syria. (Associated Press/Edlib News Network ENN)

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This image made from amateur video released by the Shaam News Network and accessed May 29, 2012, purports to show 13 blindfolded and handcuffed bodies on the ground in Deir el-Zour, Syria. (Associated Press/Shaam News Network via AP video)

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A Lebanese man (right) helps a Syrian family on Wednesday after they were shot by a Syrian border guard when they were crossing a river from Syria into Lebanon at the northern Lebanese-Syrian border town of Wadi Khaled in Akkar. (Associated Press)

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This image purports to show 13 blindfolded and handcuffed bodies on the ground in Deir el-Zour, Syria. U.N. observers discovered 13 bound corpses in eastern Syria, many of them apparently shot execution-style, the monitoring mission said Wednesday. The announcement comes days after a massacre in Houla, in the central Homs province, which killed more than 100 people and prompted worldwide condemnation against the regime of President Bashar Assad.