According to security sources, PKK militants attacked police officers with a bomb-laden car and long-barreled weapons at 5.30 am local time (0230GMT) in a highway in Turkey's southeastern province of Sirnak, The Anadolu Agency reported on Sunday.
At least two police were killed and 5 others injured in the attack; The wounded were taken to Sirnak State Hospital.
Sources added that two militants were also killed after the attack.
Turkey has staged airstrikes and ground operations against the PKK in its strongholds of southeastern Turkey and northern Iraq in a bid to inflict a mortal blow its capacities.
But the PKK has hit back, killing dozens of Turkish police and soldiers in almost daily attacks, with the bloodier attacks marking a new intensification of the conflict. More than 100 Turkish security personnel have been killed in attacks mainly in Turkey’s southeastern provinces.
Meanwhile, one police officer was killed and another injured in another PKK attack in Turkey's southeastern province of Diyarbakir.