Turkish tanks shelled Islamic State positions in northern Syria and not those of the Syrian Kurdish YPG militia, Turkish military sources said on Friday, after the YPG said it was being targeted.
The Syrian Kurdish YPG said in statement that two Turkish tanks fired dozens of shells at its positions in the area of Afrin in northwest Syria.
The French news agency AFP reports that since mid-February, Turkish howitzers stationed just inside the border had on successive days shelled targets of the Syrian Kurdish Democratic Union Party (PYD) and its armed wing, the People's Protection Units (YPG), inside Syria, with the military saying it was responding to incoming fire.
But Washington had urged Ankara to halt its fire in the run-up to the partial cease-fire in Syria.
Since then, there have been no reports of Turkey shelling the PYD, which Ankara accuses of being the Syrian branch of the outlawed Kurdistan Workers Party (PKK).
Police station bombing
Meanwhile, Turkish officials say Kurdish rebels have detonated a car bomb near a police station, killing two police officers and wounding about 35 people.
Officials say the attack took place in the town of Nusaybin in southeastern Turkey near the border with Syria.
Security forces in Nusaybin are currently fighting against militants linked to the Kurdish Workers' Party - the PKK.
Most of the victims were believed to be police officers, but at least two of the wounded were civilians.
The early-morning blast was reported to have caused extensive damage to the regional traffic police station.
The PKK has been fighting for an autonomous Kurdish government in Turkey's southeast. The Turkish government considers it a terrorist organization.
WATCH: Video footage from scene of car bombing
On Thursday in Istanbul, Turkish police shot dead two women who used guns and grenades to attack a police station. There were no reports of any police being hurt.
The women initially fled after firing at the station and hid inside a nearby building. Police surrounded the site and launched an assault that ended with the women dead.
The identity of the two attackers was not immediately known.
Istanbul has experienced attacks by both Kurdish rebels and far leftist rebels.