Turkey has launched a series of overnight air strikes against Kurdish militants, aimed at 17 targets in the south-east, the army says.
The targets were in Hakkari province on the border with Iran and Iraq.
Turkey has seen increasing violence in recent weeks between the military and Kurdish separatists from the PKK.
The strikes come a day after nine people were killed in a wave of attacks on security forces, some of them in the south-east.
A ceasefire in the long-running conflict with the group appeared to disintegrate in July, when Turkey began bombing PKK camps in northern Iraq, at the same time as launching air strikes on Islamic State (IS) militants in Syria.
Kurdish fighters, some from the PKK, have secured significant victories against IS in Syria and Iraq.
But the PKK accuses Turkey of using its campaign against IS as cover for taking on the separatists – something the government denies.
Turkey, like a number of Western countries, considers the PKK a terrorist organisation.