Turkey's state-run news agency said meanwhile that Turkish troops and allied Syrian opposition forces had entered the town of Jinderes, in the enclave's southwest, where they were engaged in street clashes with Syrian Kurdish forces.
Turkish Foreign Minister Mevlut Cavusoglu says Turkey and Iraq could conduct a joint military operation against Kurdish rebels in Iraq.
The PKK, listed as a terrorist organization by Turkey, the United States, and the European Union, resumed its 30-year armed campaign against Turkey government in July 2015 after a brief reconciliation period.
According to the Turkish General Staff, the operation, which was launched to clear YPG/PKK-Daesh terrorists from Afrin, aims to establish security and stability along Turkey's borders and the region as well as protect Syrians from terrorist oppression and cruelty.
Turkey's military and its rebel allies have besieged the northern Syrian town of Afrin and were nearing its town centre, President Tayyip Erdogan said on Friday, in what would mark a major advance in Turkey's military operation. As of now, we have Afrin encircled.
"To date 850 square kilometers have been taken under our control".
"The number of neutralized terrorists in Afrin has risen to 3,213".
Erdogan also reaffirmed his previous vows that Turkey would not limit itself to clearing the Afrin region of the YPG, saying it wanted to carry on to the town of Manbij to the east and then to the Iraqi border.
Erdogan questioned why North Atlantic Treaty Organisation had not come to Turkey s aid in its Syria operation when Ankara had backed critical alliance campaigns worldwide.
The Turkish postal service or PTT is now serving a Syrian city liberated from terrorists in 2016 by Turkish soldiers.
Turkey launched the assault into the enclave on January 20 to drive out Syrian Kurdish fighters that Ankara considers to be a security threat due to their links to outlawed rebels in Turkey.