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Pro-Syrian regime forces building up near US troops in Syria

The US-led coalition fighting ISIS has observed pro-Syrian regime forces once again conducting a slow build-up east of the Euphrates River near where US troops are present advising local allies, according to multiple US and coalition officials.

The pro-regime forces are assembling near where similar forces allied with Syrian President Bashar al-Assad initiated an unprovoked attack on US-backed Syrian Democratic Forces, US Army Col. Ryan Dillon, a spokesman for the coalition told CNN.