Syria

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Syrian fighters celebrate the victory on top of a tank they took after storming a military base in Aleppo, Syria, on Monday, Nov. 19, 2012. (AP Photo/Khalil Hamra)

In this image taken from video, which has been authenticated based on its contents and other AP reporting, Syrian rebels capture a helicopter air base near Damascus, Syria, the capital, after fierce fighting on Sunday, Nov. 25, 2012. (AP Photo/Ugarit News via AP video)

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In this image taken from video that has been authenticated based on its contents and other AP reporting, smoke rises from buildings after government shelling in the Damascus suburb of Zabadani, Syria, on Friday, Nov. 23, 2012. (AP Photo/Shaam News Network via AP video)

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In this Saturday, Nov. 17, 2012, photo, a Syrian woman walks in front of a destroyed hospital where heavy clashes took place between rebel fighters and the Syrian army to seize control over the area, on the outskirts of Aleppo, Syria. (AP Photo/Narciso Contreras)

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Opposition fighters celebrate capturing a tank after storming a military base in Aleppo, Syria, on Monday. Islamist rebels refuse to join a Western-backed coalition. (Associated Press)

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**FILE** A Syrian father and two of his sons salvage furniture from their home in Maraat al-Numan, Syria, on Nov. 17, 2012. The house was destroyed in bombing by government forces. (Associated Press)

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Agri, a Kurd from Syria who gave only his first name, said he fled his country due to fighting a few months ago. He said he was attacked in Athens as he walked home one night recently. Human rights and immigrant groups say there has been an increase in racist attacks in Greece over the last year, as the country struggles through a protracted financial crisis. (Associated Press)

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In this Wednesday, Nov. 14, 2012 photo, Syrian rebel fighters keep an eye through a hole in the wall that overlooks a position held by troops loyal to Syrian President Bashar Assad during skirmishes in Aleppo, the Syria. (AP Photo/Narciso Contreras)

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An elderly Syrian man walks next to the remains of a house was destroyed by an airstrike last Tuesday killing several Syrians, in the Maret El-Nasaneh village on the outskirts of Idlib, Syria, Wednesday, Nov. 14, 2012. (AP Photo/ Khalil Hamra)

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In this Wednesday, Nov. 14, 2012 photo, a Syrian resident gets emergency medical attention as he arrives to a hospital after he was injured by a mortar attack in Aleppo, Syria. (AP Photo/Narciso Contreras)

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In this Tuesday, Nov. 13, 2012 photo, a Syrian man is carried in the arms of his relatives at a hospital after he was injured by a mortar shell explosion in the Bab Al-Nayrab neighborhood of Aleppo, Syria. (AP Photo/Narciso Contreras)

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In this Wednesday, Nov. 14, 2012 photo, a Syrian rebel fighter aims at Syrian government forces during skirmishes in Aleppo, Syria. (AP Photo/Narciso Contreras)