Unidentified assailants have opened fire on a police station in southeastern Turkey, killing four Turkish law enforcement officers.
In the attack, which occurred on Monday in the town of Dortyol in Hatay province, gunmen sprayed the victims with bullets from a delivery truck, Reuters reported, citing Turkey's state-run Anatolia news agency.
It is not yet clear whether the Kurdistan Workers' Party (PKK) was behind the attack.
The PKK, which is on the terrorist list of a number of countries, has been fighting Turkey since 1984. Some 45,000 people are estimated to have died since the group launched its armed offensive.
In June, the militants called off a unilateral ceasefire and resumed their assaults, with their spokesman Ahmed Denis warning that "we will take our operations to all Turkish cities."
Also on Monday, a roadside bomb blast, blamed on the PKK, wounded at least six Turkish troops in the town of Lice in the southeastern province of Diyarbakir, the Anatolia news agency said.
The PKK militants launch their attacks from Iraq's Qandil Mountains in the areas under the control of Kurdistan Regional Government President Massoud Barzani. Israel and Israeli firms also operate in the Qandil mountain range.
The International Strategic Research Organization, a Turkish think tank, warned last month that retired Israeli military men and members of the Israeli intelligence agency Mossad had been sighted providing training to PKK gunmen in Iraqi Kurdistan, Press TV reported.