The Turkish army is conducting exercises with ground forces and tanks near its border with Syria, national media reported on Thursday.
Some 25 tanks took part in the exercise in the Nusaybin district of Mardin Province, just two kilometers away from the Syrian border on Wednesday.
The drills are expected to continue for a week.
Ankara has been concerned by reports that a Kurdish group linked to the outlawed Kurdistan Workers Party (PKK) controls Kurdish areas in northern Syria and near the Turkish border.
Turkey has warned it will attack PKK positions in Syria if it comes under attack.