"The regime's forces...have mounted large-scale attacks using planes, artillery, and tanks," Syrian Democratic Forces spokesman Talal Selo said in a statement.
A U.S. warplane shot down a Syrian army jet on Sunday southwest of Raqqa, with Washington saying the army had dropped bombs near U.S.-backed forces and Damascus saying the plane had been flying a mission against Islamic State militants.
Advertisement(Reporting by Ellen Francis; editing by Mark Heinrich) ((Ellen.Francis@thomsonreuters.com))
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