Media reports say Kurdish protesters have tossed a gasoline bomb onto a bus in the Turkish capital, leading to three more deaths in a sixth day of unrest in southeastern Turkey.
The reports say two people died on the bus, which was set ablaze in Sunday's attack in Istanbul. A third person was apparently killed after being hit by a vehicle on the street.
Another person was seriously injured. Images after the incident showed the bus engulfed in flames.
Earlier Sunday, a Kurdish protester was killed by police in the southeastern town of Kizilteper. A total of 12 people have now died in recent days in violence spawned by the killing of 14 members of the outlawed Kurdistan Workers Party, or PKK, by Turkish security forces.
The PKK, which operates in southeastern Turkey and has bases in northern Iraq, has been fighting Turkey for Kurdish autonomy for more than two decades. More than 30,000 people have been killed.
The United States and the European Union list the PKK as a terrorist organization.Some information for this report was provided by AFP, AP and Reuters.