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The PKK fighters were believed to be preparing an attack on Turkish border posts from the Hakurk and Metina regions of northern Iraq, the army said in a written statement.
Several caves and shelters used by the militants were destroyed in the air strikes, it said.
The PKK, which has been waging an insurgency in southeast Turkey since the 1980s, is designated a terrorist group by Turkey, the United States and the European Union. More than 40,000 people have been killed in the conflict.