At least eight Turkish soldiers have been killed in an attack being blamed on Kurdish PKK fighters on the southeastern borders with Iraq and Iran. Local officials say 10 rebels were also killed.
Another 15 were wounded in action which took place in three separate areas of Hakkari province.
Turkish authorities say they believe their troops died when guerillas crossed over from northern Iraq to attack a border post before fleeing back over the frontier.
Several thousand PKK fighters are believed to have bases in Iraq. The PKK is an outlawed organisation that Turkey, the US, and the EU class as a terrorist group.