Separately, a bomb-disposal policeman was killed by sniper fire in the Sur district of Diyarbakir, which has been under curfew for eight days.
Eastern Turkey has relapsed into bloodshed since the collapse of a ceasefire with the PKK in July and there is little sign of the violence tailing off.
Last month, Kurdish militants scrapped another unilateral truce -- called in the wake of an Islamic State suicide bomb attack in Ankara -- after President Tayyip Erdogan and the his AK Party, which won back its parliamentary majority in a November election, vowed to liquidate the PKK.
More than 40,000 people have been killed in the insurgency since it began in 1984. Erdogan oversaw a peace process with the PKK but that unraveled in July.
The PKK is designated a terrorist group by Turkey, the United States and the European Union.
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