Militants have killed at least four Turkish soldiers and injured at least 50 in a rocket attack on a convoy in the south-east, security officials say.
Most of the injured were reportedly on a bus which caught fire when the convoy was hit on a highway connecting the provinces of Bingol and Mus.
The injured were rushed to local hospitals and sources warned the death toll might rise.
Security sources blamed the Kurdistan Workers’ Party (PKK) for the attack.
The Turkish army responded to the attack with an immediate operation backed by air power in the larger Bingol area, the Turkish news agency Anatolia reports.
Prime Minister Recep Tayyip Erdogan said this week that 500 Kurdish rebels had been “rendered ineffective” by his forces in the space of a month. The government often uses the phrase to mean killed.
He specified that 123 militants had been killed over the past 10 days near the south-eastern border with Iraq.
PKK attacks on Turkish targets recently escalated. Dozens of Turkish troops and civilians, including children, have been killed in recent bombings blamed on the group.
The PKK has been fighting for an ethnic homeland in south-eastern Turkey since 1984. It is classified as a terrorist organisation by Turkey, the US and EU. In all, more than 40,000 people have died in the conflict