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Syrian rebels man a checkpoint in the northern city of Aleppo

Syrian rebels man a checkpoint in the northern city of Aleppo. A commercial hub and home to 2.5 million people, Syria's second city Aleppo has become a new front in the country's 16-month uprising, after being largely excluded from the violence

Scenes from a Civil War

Fighting between Syrian security forces and the opposition has forced thousands to flee their homes. The international community has yet to decide what to do as fighting continues in the cities of Damascus and Aleppo.