Story highlights Syria demands Turkish withdrawal after "incursion" in Idlib province

US-led coalition says 85% of city has been liberated

(CNN) ISIS is said to have suffered key setbacks in Syria, with US-led coalition forces grabbing more turf in the terror group's self-declared capital of Raqqa and the Syrian military seizing a key eastern city.

The conflict, which started in 2011, has resulted in the deaths of an estimated 400,000 Syrians and the displacement of millions.

ISIS' hold on Raqqa has eroded. Eighty-five percent of the city has been liberated from the terror group, the US-led Combined Joint Task Force said Saturday.

In a written statement, the task force told CNN that "steady progress" was being made in defeating ISIS in the group's stronghold.

The US-backed Syrian Democratic Forces said it believes few hundred militants remain in the city.

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