Raqqa, known as the de facto capital of Daesh's so-called "caliphate" since 2014, is on the verge of falling to the US-backed Syrian Democratic Forces (SDF) as their offensive against the militants nears completion.
Regime forces backed by Shia militants have killed a large number of Daesh militants and are de-mining the city in eastern Deir Ezzor province, regime media says.
The attack took place at near the border of Deir Ezzor and Hasakah provinces, and the dead included civilians fleeing the fighting in Deir Ezzor, Syrian Observatory for Human Rights said.
A ceasefire deal for a Syrian rebel enclave south of Damascus was reached on Thursday, brokered by Cairo and Moscow.
Spokesman for Russia's defence ministry said the US-led coalition sharply reduced its air strikes in Iraq to force Daesh militants into Syria.
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