Turkish soldiers patrol on a road in the southeastern province of Sirnak
Nine members of Turkey's security forces have been killed in clashes with Kurdish rebels in the south-eastern province of Sirnak, officials say.
Around 20 militants were also killed, close to the border with Syria and Iraq, Governor Vahdettin Ozkan said.
The fighting broke out late on Sunday evening and was continuing, he said.
Clashes between the army and the rebel PKK - which seeks autonomy for the Kurds - have intensified in the region in the past year, reports the BBC.
The PKK attacked a police and military complex in the town of Beytussebap late on Sunday night with guns and rocket-launchers, Turkish media reported.
Eight security officers were wounded, the governor said.
Both the US and EU classify the PKK (Kurdistan Workers Party) as a terrorist organisation. It began a guerrilla campaign for an ethnic homeland in the Kurdish heartland of south-eastern Turkey in 1984.
Fighting has increased in recent months, blamed partly on the turmoil in neighbouring Syria.
Ankara accuses Syria of allowing the PKK to operate on its territory although government forces have ceded control of some Kurdish areas of northern Syria to the opposition.
A month ago, rebels fired rocket launchers on a Turkish army border post in the middle of a large-scale military offensive in Hakkari province.
More recently, the PKK was blamed for a bombing in the south-eastern city of Gaziantep which left nine people dead, including four children. The PKK denied any involvement.