U.S. forces have stopped joint military patrols in northern Syria to counter Islamic State extremists, as Turkish threats of a ground invasion stymie those missions with Kurdish forces, AP reports.

Other more limited security patrols by U.S. and Kurdish troops, particularly around prisons, will begin again on Saturday, officials said. U.S. Central Command on Friday said American troops have paused all of the joint operations with the Kurdish-led Syrian Democratic Forces against IS in Syria.

The Pentagon had said Thursday they were ongoing but reduced . “The SDF continues to conduct patrols and maintain security at the al-Hol displaced persons camp and the detention facilities, prisons,” said Army Col. Joe Buccino, the Central Command spokesman.

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