A Kurdish military source told Reuters separately the next phase of a campaign by the U.S.-backed Syrian Democratic Forces (SDF) alliance -- which includes the Kurdish YPG militia -- aimed to cut the last remaining routes to Islamic State's stronghold of Raqqa city, including the road to Deir al-Zor.
The YPG has been the main partner on the ground in Syria for the U.S.-led coalition against Islamic State, fighting as part..."
https://www.yahoo.com/news/u-backed-syrian-alliance-says-gets-more-u-111108389.html?ref=gs