"I condemn this violence carried out in the manner of a summary execution," government spokesperson Bulent Arinc told reporters.

"This is utterly wrong. I express my condolences," he said.

His remarks came just hours after three Kurdish women, a co-founder of the outlawed Kurdistan Workers' Party (PKK) and two other activists, were founded shot dead in Paris early Thursday, in what French authorities labelled an "assassination."

Speaking from Senegal, Prime Minister Recep Tayyip Erdogan said it was "too soon to comment" but the incident could be a "provocation" coming at a time when peace talks between the state and the PKK's jailed leader Abdullah Ocalan were under way.

The killings came days after Turkish media reported Turkey and the PKK leadership had reached a roadmap to end the three-decade old insurgency that has claimed tens of thousands of lives. Neither side has confirmed the reports.

The deal was reportedly reached during a new round of talks between Ankara and Ocalan, which the government acknowledged to be ongoing for weeks with the aim of disarming the rebels.

"It could be an internal feud, and then there is this effort we are making against terror," Erdogan said, referring to the talks. "We want to move forward and there are those who do not like it."

The PKK, considered a terrorist organisation by Turkey and much of the international community, took up arms in 1984 to obtain self-rule in Turkey's Kurdish-majority southeast.