The Turkish air force immediately scrambled warplanes to strike PKK targets in southeast Turkey in retaliation, marking a further intensification in the latest flare-up of the decades-long conflict.
In a sign of the gravity of the attack on Sunday, Prime Minister Ahmet Davutoglu broke off a trip to Konya to watch a national football game and summoned an emergency security meeting in Ankara, the official Anatolia agency said.
"Two of our armoured vehicles were severely damaged by improvised explosive devices left on the road," the army said, adding: "Some of our brave soldiers were killed and others injured as a result of the explosion."
Two Turkish F-4 and two F-16 warplanes were deployed to carry out strikes in a "heavy air campaign" against 13 targets controlled by the militants in retaliation, it added.
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Many "terrorists" were killed in the air strikes, Anatolia said, without giving a precise toll.
He added the attack happened during a "clean-up operation" against PKK militants.
The PKK claimed the attack as an "act of sabotage" in a statement on the website of its military wing, the People's Defence Forces (HPG).
The group, which is known for sometimes exaggerating tolls of attacks on the security forces, said 15 soldiers had been killed.