Turkish security forces have closed a border crossing between the two countries after Kurdish fighters captured the village of Şişli, the latest development in a string of recent advances by the Kurdistan Workers Party (PKK) in Turkey.
Turkish officials said that the border crossing, known as Şiyık in Kurdish, had been closed on Tuesday night.
Şiyuk is located about 25km south of the city of Diyarbakır in southeastern Turkey.
Kurdish fighters have seized control of the town of Ŝişlık and its surrounding villages in recent months.
Turkey, a member of the US-led coalition fighting the PKK, has been fighting the militants since 1984, when a ceasefire brokered by the US and Turkey was implemented.
It has accused the PKK of carrying out attacks on Turkish civilians, and has accused them of carrying a weapons programme that includes suicide bombers.
The PKK is listed as a terrorist organisation by Turkey, the US, Europe and many other countries.