Four Turkish police killed in roadside bomb attack

Four police officers were killed and two others wounded in roadside bomb explosion on Monday as a police vehicle passed by in the Kurdish-majority south-eastern Turkey, the local governor's office said.

The attack took place in the Sur neighbourhood of Diyarbakir province, where the Turkish army launched an intensive campaign last year against the outlawed Kurdistan Workers' Party (PKK). 

"An attack was carried out when explosives… detonated as an armoured vehicle carrying our riot police was passing by," the governor's office said in a statement.

It was not immediately clear who carried out the attack but the state-run Anadolu news agency blamed "PKK terrorists".

The governor's office called it "an atrocious terror attack", vowing that Turkey would continue to fight "against terror" with determination.

Turkey has been on edge after a wave of attacks blamed on members of outlawed Kurdish groups, as well as Islamic State group militants.

The PKK — designated as a terror organisation by Ankara, the United States and the European Union — has been waging an insurgency against Turkey since 1984.