Officials say at least 11 people have been killed by a blast which targeted a police bus in central instanbul.
The device was triggered as the vehicle passed through the busy vezneciler district at the morning rush hour.
So far, no group has yet said it carried out the attack.
Reports said gunfire was heard in the area after the blast.
The explosion happened near the city historic beyazit square neighborhood, a major tourist attraction.
At least 36 other people were injured.
– BBC NEWS.