One man was killed and five officers were injured during clashes between Kurdish protesters and police in south-eastern Turkey.
The PKK has been fighting for a Kurdish homeland since the 1980s
Around 1,000 Kurds were demanding the release of the bodies of six men accused of being Kurdish separatists in the town of Batman.
The six were killed during fighting with the Turkish military last week.
The violence comes after the Kurdistan Workers Party (PKK) announced a unilateral ceasefire 10 days ago.
Police asked the protestors to disperse and fired warning shots, tear gas and water cannon. They said the dead man had been hit by a stray bullet.
Turkish forces launched an operation against PKK militants in Batman last Thursday, when the six suspected rebels were killed.
The fighting came just a week after the PKK ordered its armed wing to refrain from violence for a month.
The PKK has led an armed struggle for an ethnic homeland in southeast Turkey since the mid-1980s.