"We asked the French authorities to increase the level of security around our interests and representations in France, to prevent any kind of incident," the official said.

"We also alerted our missions, first and foremost in Europe and of course in France, to be on alert."

Sakine Cansiz, a founding member of the Kurdistan Workers Party (PKK), and two fellow activists were found shot in the head early on Thursday in an attack which overshadowed peace moves between Turkey and the guerrillas.

Turkey's pro-Kurdish Peace and Democracy (BDP) party, on Thursday condemned the killings and called on Kurds "wherever they are" to hold protest meetings. There is a large Kurdish diaspora in Europe.