On Monday, Turkish combat aircraft performed an airstrike against a Kurdish SDF base in Syria's Hasakah province, according to the al-Ikhbariya broadcaster.
Earlier, Erdogan stressed that a security zone is needed in order to counter "terror threats" coming from the Kurdish PKK party and Syrian Kurdish YPG forces, adding that it would allow for the return of Syrian refugees.
Meanwhile, Washington has started to withdraw its troops from the area. The White House said it would not "support or be involved in" Turkey's operation.
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