Armed clashes persisted on Sunday across Turkey's south-east, where an operation by Turkish forces intensified on the sixth day of a campaign that security sources said had resulted in the death of 110 Kurdish militants.
Protests erupted in Istanbul and in Diyarbakir, the biggest city in the country's south east, with hundreds demonstrating against the military operations. Police fired tear gas and plastic bullets to disperse the crowds.
Most of the fighting took place in Cizre and Silopi, towns near the Iraqi and Syrian borders that have been under curfew for almost a week. Nusaybin and Dargecit in the border province of Mardin and the historical Sur district of Diyarbakir have also seen fierce battles. Although rooted in the countryside, militants of the Kurdistan Workers Party (PKK) have shifted focus in recent years to towns and cities in the south-east, digging trenches and setting up barricades in streets to keep security forces away.
Security sources and residents said around 300 houses in Cizre had been damaged by the clashes and undetonated mortar shells lay inside buildings. Electricity was cut in many neighbourhoods in Silopi as power transformers were damaged. Food and drinking water were running scarce, residents said.
A two-year cease-fire between Turkey and the PKK fell apart in July, shattering peace talks and reviving a conflict that has ravaged the mainly Kurdish south-east for three decades.
"We will not get tired," Prime Minister Ahmet Davutoglu said in a speech to his ruling party's supporters. "We will fight day and night until all mountains, cities, districts and neighbourhoods of this country are cleansed of terror centres." The latest security operations, which media reports said were being conducted with 10,000 police and troops backed by tanks, were the largest since the end of the cease-fire.
Tanks deployed on hills surrounding Cizre have shelled PKK targets inside the city, while a military convoy of 30 armoured vehicles stormed one of the districts.