Censor.NET reports citing DW.
A remote-controlled bomb exploded as a service shuttle carrying police officers was passing in the Beyazit district, state-run TRT television reported.
Eleven people were killed in the explosion, including seven police officers, Istanbul Governor Vasip Sahin confirmed shortly after the attack. "A car-bomb attack was made against vehicles carrying our rapid-response police and passing by on the road, resulting in seven police and four civilians losing their lives," Sahin said. He added at least 36 people had been injured.
The explosion took place close to the Vezeciler metro station which is within walking distance of some of the main sights of the historical center, including the Suleymaniye Mosque.
No group has claimed responsibility for the attack so far.
As reported, Turkey has experienced a string of terrorist attacks since the beginning of the year.