Bomb kills police in Turkey

Four police officers have been killed in a bomb blast that rocked the Kurdish-dominated south-eastern Turkish city of Diyarbakir.

At least 14 people were injured in the explosion near a bus station, security sources said. It is not known who was behind the blast.

Turkey’s army is locked in an operation against rebels from the Kurdistan Workers Party (PKK) in the region.

A ceasefire between the government and the PKK collapsed in July last year.

Since then violence has surged, with militants attacking security forces and the army besieging Kurdish-dominated towns.

The bomb reportedly detonated as an armoured police vehicle drove past. Both civilians and police were among the wounded.

The Dogan news agency blamed terrorists for the blasts.

The attack comes ahead of a planned visit to Diyarbakir by Turkish Prime Minister Ahmet Davutoglu on Friday.

The TAK, an offshoot of the PKK, has claimed two bombings in Ankara this year that killed more than 60 people.

Turkey is also part of the coalition battling so-called Islamic State and has also been attacked by the militant group.