Delivering a fatal blow to terrorist leaders in an attempt to kill off the entire groups rarely has the desired effect and amounts to little more than militaristic box-ticking, writes Arie W Kruglanski

Oil prices jumped sharply today after Turkish forces entered northern Iraq in search of Kurdish rebels, raising fears that the conflict would cut oil supplies from the region.

The Turkish army sent soldiers about two miles into northern Iraq today, a spokesman for Kurdish security forces said.

Turkey’s president today said his country “has decided” on how to proceed against Kurdish rebels in northern Iraq and had informed the US.

Six men arrested following the killing of filmmaker Theo van Gogh are no longer suspects in the murder, but still face charges of belonging to a terrorist group, authorities said today.