Four members of the outlawed Kurdish Workers' Party (PKK) were killed in a clash with Turkish security forces in southeast Turkey on Monday, the semi-official Anatolia news agency reported.
One Turkish soldier was also killed and another injured in the clash following a harassment fire by PKK rebels in Silvan town of southeastern Diyarbakir province, Xinhua reported.
A group of PKK militants opened harassment fire at the Bagdere Gendarmerie Outpost in the province, said the report, adding that a military operation is under way in the region.
On Saturday, PKK members attacked a military outpost, killing nine Turkish soldiers and injuring 14 others, while a mine blast killed two Turkish soldiers and injured two others, both in Semdinli town of Hakkari province bordering Iraq on Saturday.
The PKK rebels have used northern Iraq as a springboard to stage hit-and-run attacks on Turkish targets in their decades-long campaign for autonomy in Turkey's Kurdish-dominated southeast.
The Turkish military says around 4,000 rebels are based just across the border in Iraq and that about 2,500 operate inside Turkey.
Listed as a terrorist organization by the Turkish government, the United States and the European Union, the PKK took up arms in 1984 to create an ethnic homeland in southeastern Turkey. Some 40, 000 people have been killed in the conflicts.