Turkish jets have kept up bombing raids on Kurdish rebel bases in northern Iraq overnight.
Turkey is seeking support from its neighbours in its fight against the rebels.
The violence erupted after clashes on Wednesday left 24 soldiers dead and 18 wounded.
The string of coordinated rebel attacks dealt the worst blow to the Turkish army since 1993, when 33 unarmed soldiers were killed in Bitlis province.
The Turkish army has said that the air and ground strikes against the rebels are "mainly" in Turkey, with a "few" in Iraq.
"While the majority of the land and air operations are in (Turkey), mainly in the Cukurca region, ground and air strikes are ongoing in a few points in northern Iraq across the border," the army said in a statement posted on its website.
Cukurca, in southeastern Turkey's Hakkari province, is on the border with Iraq.
The latest cross-border ground incursion by Turkey into northern Iraq, an autonomous Kurdish region, was in February 2008, when the army struck against the Zap region.
Clashes between the PKK and the Turkish army have escalated since the summer.
The PKK, listed as a terrorist organisation by Turkey and much of the international community, took up arms in Kurdish-majority southeastern Turkey in 1984, sparking a conflict that has claimed some 45,000 lives.
