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.

The army said the PKK attack on two military vehicles in a convoy in the Daglica district of Hakkari -- a known PKK stronghold -- had killed several soldiers and wounded others.

"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.

Many "terrorists" were killed in the air strikes, Anatolia said, without giving a precise toll.

President Recep Tayyip Erdogan said he was "very sad" about the attack on the Turkish soldiers in a live television interview, but also did not give any casualty figures.

"A mine attack has been staged. There will be a very particular and decisive fight there. We are very sad," he told the A-Haber channel.

"The weather conditions were unfavourable. A struggle was being waged under such conditions," he said, adding that the attack happened during a "clean-up operation" against PKK militants.

- 'Act of sabotage' -

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 the security forces, said 15 Turkish soldiers had been killed.

Unofficial reports on the Internet had also indicated that the death toll was considerably higher than in any other PKK attack during a current spike in unrest in Turkey.

It is extremely unusual for the Turkish army not to give a precise death toll in the aftermath of an attack, leading to speculation that the number was unusually high, or simply not known.

Davutoglu, who had watched Turkey defeat the Netherlands in a key Euro 2016 qualifier in Konya, was rushed in his motorcade to attend the security meeting with officials, including army chief of staff Hulusi Akar and spy chief Hakan Fidan.

The PKK has been staging daily attacks against the Turkish armed forces as the military presses an over month-long operation against the group in southeast Turkey and northern Iraq.

The violence has left in tatters a 2013 ceasefire aimed at assisting the search for a final peace deal to end the PKK's three-decade insurgency that has claimed tens of thousands of lives.

The PKK initially took up arms in 1984 in search of an independent Kurdish state for Turkey's Kurdish minority, although latterly the demands focused on greater autonomy and rights.

Earlier Sunday, two Turkish police were killed in an attack in the Sur district of southeastern city of Diyarbakir that was attributed to the PKK, security sources told AFP.

Some 70 members of the security forces have been killed since July in attacks blamed on the PKK, while official media have claimed that at least 967 militants have been killed.

The unrest comes at a explosive time in Turkey as the country prepares to hold snap elections on November 1 following June polls where Erdogan's ruling party lost its overall majority.