Syria

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This citizen journalism image taken on April 25, 2013 and provided by Aleppo Media Center AMC, which has been authenticated based on its contents and other AP reporting, shows members of the free Syrian Army preparing their weapons in the neighborhood of al-Amerieh in Aleppo, Syria. (Associated Press/Aleppo Media Center AMC)

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** FILE ** Rebels from al-Qaeda-affiliated Jabhat al-Nusra wave their brigade flag as they step atop a Syrian air force helicopter at the Taftanaz Air Base, which was was captured by the rebels, on Friday, Jan. 11, 2013, in Idlib province in northern Syria. (AP Photo/Edlib News Network)

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Anti-Syrian-regime protesters holding Syrian revolution flags during a rally marking the anniversary of the 1946 withdrawal of French troops from Syria, which marked the end of France's mandate of the Arab country, in the old quarter of the northern city of Aleppo, Syria, on Wednesday, April 17, 2013. (AP Photo/Aleppo Media Center AMC)

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**FILE** In this citizen journalism image provided by Edlib News Network and authenticated based on its contents and other AP reporting, rebels from al Qaeda-affiliated Jabhat al-Nusra sit on a truck full of ammunition at Taftanaz air base, which was captured by the rebels, in the Idlib province of northern Syria. (Associated Press/Edlib News Network)

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**FILE** In this citizen journalism image provided by Edlib News Network, which has been authenticated based on its contents and other AP reporting, rebels from al Qaeda-affiliated Jabhat al-Nusra wave their brigade flag on the top of a Syrian air force helicopter on Jan. 11, 2013, at the Taftanaz air base in the Idlib province of northern Syria that was captured by the rebels. (Associated Press/Edlib News Network)

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** FILE ** In this Monday, March 18, 2013, file image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, the free Syrian Army fighters fire at Syrian army soldiers during a fierce firefight in Daraa al-Balad, Syria. (AP Photo/Shaam News Network via AP video, File)

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** FILE ** In this Thursday, March 28, 2013, file image taken from video obtained from the Ugarit News, which has been authenticated based on its contents and other AP reporting, fighters from the Syrian Free Army fire on a Syrian army position in Deal less than 15 kilometers (10 miles) from the Jordanian border in Daraa province, Syria. (AP Photo/Ugarit News via AP video, File)

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** FILE ** Fighters from the Syrian Free Army fire on a Syrian army position in Deal, Syria, less than 10 miles from the Jordanian border in Daraa province, on Thursday, March 28, 2013, in an image taken from video that was authenticated based on its contents and other AP reporting. (AP Photo/Ugarit News via AP video)

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** FILE ** In this Friday, Dec. 14, 2012, file photo, a Syrian rebel checks an anti-aircraft weapon, in Maaret Misreen, near Idlib, Syria. (AP Photo/Muhammed Muheisen, File)

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** FILE ** In this Thursday, March 28, 2013, photo released by the Syrian official news agency SANA, a Syrian doctor treats an injured man who was wounded at the open-air cafeteria at Damascus University in the central Baramkeh district, in Damascus, Syria. More than 6,000 people were killed in the Syrian civil war in March alone, according to a leading activist group that reported it was the deadliest month yet in the 2-year-old conflict. (AP Photo/SANA, File)

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** FILE ** Syrians inspect houses destroyed by a Syrian forces airstrike in the al-Marjeh neighborhood of Aleppo, Syria, on Tuesday, March 19, 2013, in this citizen journalism image provided by the Aleppo Media Center and authenticated based on its contents and other AP reporting. (AP Photo/Aleppo Media Center)