At least four people have been killed and up to fifteen others injured after a bus carrying Turkish military personnel was hit by a bomb blast.
The attack took place in the country’s largest city, Istanbul and comes a day after authorities stepped up operations against Kurdish separatists.
The explosion occurred near a military housing complex in the district of Halkali.
It is unclear how many passengers were on the bus or how many were soldiers.
No one has claimed responsibility for the blast but militants from the illegal Kurdistan Workers Party, or the PKK, is likely to be blamed.
PKK guerrillas killed 11 soldiers at the weekend.
In response, Turkish commandos backed by helicopters deployed along the Iraqi border as pressure mounts on the government to rein in escalating violence in the mainly Kurdish southeast.