US says claim it supported IS in Syria is 'ludicrous'

The US has described as "ludicrous" a claim by Turkish President Recep Tayyip Erdogan that it supported so-called Islamic State (IS) in Syria. State Department spokesman Mark Toner said there was no basis for such an accusation. The Turkish leader earlier said he had evidence and also said the US had supported the Kurdish YPG and PYD groups. Turkish troops have been fighting to push IS out of northern Syria.
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