Turkish forces bombarded YPG/PKK positions on the eastern shore of the Euphrates River in northern Syria, state-owned Anadolu news agency said on Sunday.
The move comes two days after President Recep Tayyip Erdoğan issued what he said was a "final warning" to those who would endanger Turkey's borders, saying Ankara was determined to focus its attention on YPG/PKK militants east of the Euphrates.
The bombardment targeted the Zor Magar area to the west of northern Syria's Ayn al-Arab region and was aimed at preventing "terrorist activities", Anadolu reported.
Turkey considers the YPG/PYD a terrorist organisation and an extension of the outlawed PKK, which has been waging a terror campaign against Turkey for more than three decades.
Turkey carried out an offensive against YPG terrorists in northern Syria's Afrin region earlier this year.
The YPG/PKK took control of large areas of northeast Syria in 2012 as the pro-Assad forces pulled out to fight rebels in the West.