A bus was set on fire during a demonstration by supporters of the Kurdistan Workers' Party (PKK) in Istanbul on Friday.
Kurdish protesters have clashed with police in Turkey during demonstrations marking the 14th anniversary of the arrest of Kurdistan Workers' Party (PKK) leader Abdullah Ocalan.
The clashes broke out in several southeastern provinces and in the city of Istanbul on Friday.
Police fired tear gas and used water cannon to disperse protesters in two towns in Hakkari province, while in Mardin three demonstrators and a police officer were injured in clashes.
Security forces also arrested dozens of protesters in Sirnak and Sanilufra.
Demonstrations were also held in Istanbul, in which protesters set two buses on fire.
Ocalan, who was captured by Turkish security forces in the Kenyan capital Nairobi in 1999, is serving a life sentence at Imrali Island prison on charges of leading the PKK in its armed campaign against Ankara.
The PKK has been fighting for an autonomous Kurdish region in southeastern Turkey since the 1980s. The conflict has left tens of thousands of people dead.