VIDEO: Pakistan's unseen offensive - BBC

The BBC's Orla Guerin was given rare access to the frontline in the tribal region of Bajaur

The Pakistani army is preparing a new offensive in the tribal areas adjoining the Afghan border, the main stronghold of Pakistan's Taliban leader, Baitullah Mehsud.

Much of the fighting against militants is taking in remote mountains and valleys - and much of the action is unseen.

Our Pakistan Correspondent Orla Guerin was given rare access to the frontline in Bajaur, part of the tribal belt, where the Taliban have been putting up strong resistance.