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Free Syrian Army fighters in a building look up after hearing a MIG fighter jet in Deir al-Zor...Free Syrian Army fighters in a building look up after hearing a MIG fighter jet in Deir al-Zor October 14, 2013. Picture taken October 14, 2013. REUTERS/Khalil

Khalil Ashawi/Reuters

Free Syrian Army fighters listen to government fighter jets flying over their heads in Deir al-Zor, Syria