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Syrians look at the bomb damage allegedly caused by pro-government forces in a neighborhood held by rebel forces in the northern city of Aleppo on December 16, 2013. The Syrian air force was accused of killing 76 people by unleashing barrels packed with explosives on Aleppo, a focal point for fighting between regime and rebel forces. AFP PHOTO / MOHAMMED AL-KHATIEBMOHAMMED AL-KHATIEB/AFP/Getty Images
Syrians look at the bomb damage allegedly caused by pro-government forces in a neighborhood held by rebel forces in the northern city of Aleppo on December 16, 2013. The Syrian air force was accused of killing 76 people by unleashing barrels packed with explosives on Aleppo, a focal point for fighting between regime and rebel forces. AFP PHOTO / MOHAMMED AL-KHATIEBMOHAMMED AL-KHATIEB/AFP/Getty Images

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    Reports: Aleppo battered by barrel bombs

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Reports: Aleppo battered by barrel bombs

Opposition activists in Syria say Aleppo has been pummeled by deadly airstrikes. CNN's Arwa Damon reports.

Reports: Aleppo battered by barrel bombs

Opposition activists in Syria say Aleppo has been pummeled by deadly airstrikes. CNN's Arwa Damon reports.