Islamic State affiliates have seized large amounts of territory in Afghanistan according to officials.
Witnesses say hundreds of insurgents loyal to IS have pushed out the Taliban in the region and scorched the country's opium poppy fields.
But as our Correspondent in Istanbul, Olly Barratt reports, US government officials are questioning whether the Islamic State can gain a significant foothold in Afghanistan.
IN: The US doesn't believe …
OUT: SOC
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