REPUBLIKA.CO.ID, DAMASCUS -- As many as 300 family members of the Islamic State (IS/ISIS) militants fled a northern Syrian city following the recent military progress made by the Syrian army and a newly-formed rebel group called Syrian Democratic Forces (SDF), a monitor group reported on Monday.

Tens of children and women were among those who fled the city of Manbej, in the northern countryside of Aleppo, to the IS de facto capital of al-Raqqa in northern Syria, according to the Syrian Observatory for Human Rights.

The UK-based watchdog group said the IS distributed the fleeing families to housing units inside al-Raqqa.

The mass departure came after the SDF managed to cut roads connecting Manbej with other IS-controlled areas on the western bank of Euphrates and the progress of the Syrian army on the eastern road connecting Manbej with other areas, which made the city almost under full siege.

The SDF, a new Western-backed rebel alliance, has recently been making progress against the IS in northern Syria, mainly in the northeastern province of al-Hasakah.

The SDF, an alliance of Kurdish, Syrian Arab, Assyrian Syriac Christian and Turkmen militias in cooperation with the Kurdish People's Protection Units (YPG), said their aim is to fight the IS in northern Syria.

However, the SDF and the Syrian army have neither cooperated nor fought one another.

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