Turkey launched its operation against the Kurdish militia last weekend.
US troops are not present in Afrin but are embedded with the SDF in other parts of Syria, where they are working to prevent a resurgence of the Islamic State group.
State-run news agency Anadolu said ground forces had already taken 15 villages and other locations in their advance into Syria.
"Their patrols are continuing and also air patrols".
Here are news, reports and events that may affect Turkish financial markets on Friday. In a dramatic move, Turkish military shot down Russian warplane for violating Turkish airspace on November 24, 2015.
U.S. Defense Secretary Jim Mattis said Turkey's offensive distracted from efforts to defeat Islamic State. President Donald Trump reportedly warned Erdogan to avoid "destructive and false rhetoric" in a phone call with the Turkish leader this week, a statement Ankara claims Trump never issued. They were the biggest critics of the "çözüm süreci" (solution process) which was initiated by the government in 2013, to bring the decades-old conflict between the Turkish state and the Kurdish insurgents to an end.
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Meanwhile, US and Turkish military commanders discussed the possibility of creating a "secure zone" along the border with Syria, a Pentagon spokesman said Thursday amid Turkey's ongoing military operation in northwestern Syria's Afrin against the YPG and Daesh. He called it a grave and very painful situation, accusing the United States of working with terrorist organizations.
Damascus regards Ankara as its mortal enemy, and when the Afrin Operation began Al-Assad described it as part of "the policy the Turkish regime had adopted since the first day of the Syrian crisis and that is built on its support for terrorism and terrorist organisations". Cavusoglu said until trust is restored, no deal can be made.
Critics have also pointed to the first Euphrates Shield Operation in which 78 Turkish soldiers lost their lives even as it failed to achieve its objectives.
In his previous statements on the issue, Cavusoglu assured that Ankara was informing Russian Federation and other states about the progress of the operation, including US Secretary of State Rex Tillerson.
Erdogan promised the operation would continue until "we reach our goals", adding: "After we will, as promised, clean up Manbij of terrorists".
The Kurdish-led administration of northeastern Syria appealed for a mass mobilisation in defence of Afrin.
Two people, a Turk and a Syrian, were killed on Wednesday after two rockets fired from Syria by the YPG landed in the border town of Kilis, the local governor said.