>> A building in central Istanbul, ripped apart by a huge explosion. Onlookers gathering, but going little further than what were once the windows. The target in the Turkish city was not apparently this building, but a bus outside packed full of police officers. The twisted remains of a car bomb attack in a district near a major tourist site.
Reuters reporter Humeyra Pamuk is at the scene.>> There was no immediate claim of responsibility, but Kurdish militants have carried out similar attacks in the past. Turkey faces multiple security threats. Both from Kurdish militants and Islamic State, which have carried out large scale attacks in Turkey's big cities as well as the rest of southeast.
>> Officials say at least 11 people are dead, 7 of them police officers. Another 36 people wounded, some of them critical. Media reports say the car packed with explosives was detonated by remote control as the police bus drove past. There has been no immediate claim of responsibility. The Kurdish militants, Islamic State, and radical leftists have all staged recent attacks in Turkey, leaving the country on high alert.