Police detained four people after a car bomb attack on a bus carrying Turkish police officers killed 11 people in Istanbul Tuesday, according to Turkey's state-run news agency.
Istanbul's governor Vasip Sahin told reporters near the scene that 36 people were wounded in the attack and three of them were in a critical condition. Seven of the dead were police officers, according to Sahin.
The blast occurred at a busy intersection near an Istanbul University building in the city's Beyazit district during the morning rush hour.
