Bomb hits Istanbul bus, kills four

A remote-controlled bomb that hit a bus carrying Turkish soldiers and civilians has killed four people and left at least 12 injured near Istanbul.
The explosion took place when the vehicle was passing through the Halkali district on the outskirts of the city.
No-one has claimed responsibility, though correspondents say suspicion will fall on the PKK Kurdish rebel group.
The PKK has recently stepped up its attacks on Turkish military targets.
The bus had just left a military residential compound in the Istanbul suburb when a roadside bomb exploded, killing three soldiers and the teenage daughter of an officer, local media reports said.