In the latest incident, three people died after a Molotov cocktail set ablaze a bus in Istanbul on April 2.
The rioting began in the mainly Kurdish region of southeastern Turkey after Turkish troops killed 14 pro-autonomy Kurdish guerrillas.
Dozens more people have been injured, mostly members of the security forces.
Meanwhile, an armed rebel group known as the Kurdistan Freedom Falcons threatened in a statement issued on April 3 to strike at tourist targets across Turkey.
(AFP, AP)