Turkey's recent military purge will make working with the country to combat Islamic State more difficult, US Director of National Intelligence James Clapper said on Thursday.
"It's having an effect because it has affected all segments of the national security apparatus in Turkey," Clapper said at the Aspen Security Forum.
"Many of our interlocutors have been purged or arrested. There's no question this is going to set back and make more difficult cooperation with the Turks."
Since the coup two weeks ago, more than 15,800 people in Turkey have been detained, some 10,000 of them from the military, according to Turkish government figures. In total more than 8,100 arrest warrants have been issued.
Late Wednesday, Turkish President Recep Tayyip Erdogan discharged 1,684 army officers, 149 of them generals.
Turkey is an important partner for the US in the fight against Islamic State. The NATO base at Incirlik is used by the US-led alliance to launch air raids against the militant group.