Birds fly in front of Turkish-backed Syrian rebels walking in the northwestern border town of al-Bab on February 23, 2017 after they fully captured the town from the Islamic State (IS) group. Al-Bab, just 25 kilometres (15 miles) south of the Turkish border, was the last IS stronghold in the northern Syrian province of Aleppo. (Photo by Nazeer al-Khatib/AFP Photo)
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