Istanbul bomb attack on police bus kills 11

A car bomb attack targeting a police bus has killed seven officers and four civilians in central Istanbul.

The blast happened during the morning rush hour in central Istanbul

It was the fourth major attack in Turkey's largest city this year. No group has claimed it, but President Recep Tayyip Erdogan pointed to the involvement of Kurdish militants.

Turkish media said four people had been arrested but gave no details. The banned Kurdistan Workers' Party (PKK) and one of its offshoots have claimed previous attacks on security forces.

The explosion also damaged nearby buildings

The attack happened near the city's historic Beyazit Square neighbourhood, a major tourist attraction, and an Istanbul university building.

The explosives were remotely detonated as the bus passed through the busy Vezneciler district at the morning rush hour, Istanbul's governor, Vasip Sahin, said. About 36 other people were injured, he added.

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Visiting some of the wounded in hospital, Mr Erdogan said: "These (attacks) are being carried out against people whose duty it is to ensure the security of our people."

"These cannot be pardoned or forgiven. We shall continue our fight against terrorists tirelessly until the end."

Turkey's Foreign Minister, Mevlut Cavusoglu, said the attackers were "cold-hearted" for exploding bombs on the holy Muslim month of Ramadan, which is in its second day.