Paris (AFP) - France called Sunday for Turkey to immediately halt the bombing of Kurdish forces in Syria and said it was concerned at the "worsening" situation in northern Syria.

Echoing an appeal made by the United States on Saturday, France called for "an immediate halt to the bombing, both that of the regime and its allies throughout the country and that of Turkey in the Kurdish zones".

On Sunday, the Turkish army struck positions held by Kurdish fighters inside Syria for a second day, with Turkish state media reporting that it was in response to incoming fire.

The army hit Democratic Union Party (PYD) targets around the Syrian town of Azaz using howitzers stationed on the Turkish side of the border, Anatolia news agency reported.

The French foreign ministry said it was concerned at the "worsening situation" around the besieged city of Aleppo and elsewhere in northern Syria.