According to the TV channel Al-Mayadin, the armored column entered the southern part of the Aleppo province to crush the Kurdish fighters in the Afrin area.
At the same time, the Firat news agency reports that Kurdish militants in one of Afrin's districts had repelled attacks by the Free Syrian Army, a militant group backed by Ankara. The reports said that the militants shot down three Turkish tanks and forced the forces to retreat.
It was also reported that fierce clashes are ongoing in the region.
The development comes shortly after Turkish President Erdogan said that Ankara will not limit its military actions in Syria to the Afrin operation that has entered its fifth day on Wednesday. The president warned that the country's military will "thwart games" on the Turkish borders, starting from Manbij.
Ankara announced the start of the Olive Branch Operation on Saturday amid reports that the US was going to create a security force in the north of Syria, which would largely consist of militants from the Kurdish armed organizations, such as People's Protection Units (YPG). The news has prompted the rage in Ankara, with the president promising to "nip in the bud" those forces.
The PKK was formed to start a fight for the creation of an independent state; however, they later demanded autonomy. Kurds live in parts of southeastern Turkey, Syria, Iraq, and Iran.