It comes as Turkey's president has promised his forces will press on towards the I-S stronghold of Raqqa.
Turkish-backed forces in race with Syria to take al-Bab
Lực lượng do Thổ Nhĩ Kỳ hậu thuẩn chạy đua với Syria để chiếm al Bab Source: AAP
Turkish-backed opposition fighters are in a race with Syrian government forces to seize the town of al-Bab from militants of the self-proclaimed Islamic State.
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