As the U.S. considers a military strike in Syria, take a look at some of the key things to know about the conflict and the country.
Not all rebels are Syrian. Thousands of foreign fighters are believed to have traveled to Syria to join the rebels since early 2011. The Washington Institute for Near East Policy estimates the total at between 2,000 and 5,500. That group includes hundreds of Europeans, the institute says. And there have also been reports of several people from the United States fighting with the rebels.
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National Portrait Gallery, London
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