Tensions flared with Kurds after an ISIL suicide bombing in the southeastern Turkish city of Suruc on Monday killed 32 people. Kurdish groups held the Turkish government responsible, saying it had not been aggressive in battling ISIL.
On Wednesday, the PKK claimed responsibility for killing two Turkish police officers near the Kurdish majority city of Sanliurfa, near the Syrian border.
In other attacks, seven police officers were wounded after suspected PKK fighters hurled a small bomb at a police station in Bismil, near the mainly Kurdish city of Diyarbakir, the Dogan news agency reported Friday. Another small bomb was thrown at officers in a police vehicle in Semdinli, near the border with Iraq, the agency said.
On Friday, Turkey announced that it was allowing its air bases to be used by the U.S.-led coalition forces for operations against ISIL.
Turkey had been reluctant to join U.S.-led coalition airstrikes against ISIL. It had long insisted that coalition operations should also target Syrian President Bashar al-Assad's regime, which Ankara blames for all ills in Syria, and it also pressed for the establishment of a no-fly zone inside Syria, along the Turkish border.
Foreign Minister Mevlut Cavusoglu on Saturday did not confirm Turkish news reports that claimed the United States and Turkey had agreed to establish a secure area in Syria, saying safe zones would be automatically formed in Iraq and Syria once the ISIL threat disappears.
"At the end of this efficient fight against ISIL, areas that have been cleared of ISIL [fighters] will become safe zones," Cavusoglu said.
On Friday, three F-16 jets struck ISIL targets that included two command centers and a gathering point near the Turkish border in Syria. The Syrian Observatory for Human Rights said nine ISIL fighters were killed in the raids. The group has yet to comment on the strikes.
The Syrian government has so far refrained from commenting on Turkish strikes inside Syrian territory, but Syria's main political opposition group, which is backed by Ankara, welcomed Turkey's move.
Al Jazeera and wire services