PKK terrorist Ismail Surgec was in the red category of the Turkish Interior Ministry's wanted terrorists list.
Negotiations between the opposition and rebel groups and Russia come as UN chief Antonio Guterres renews call for an "immediate cessation" to regime operations in Daraa province.
As troops advance, up to 400,000 civilians are at risk of being displaced by the offensive. Residents of western Mosul have been facing food and fuel shortages, according to the UN humanitarian coordinator for Iraq.
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