Return of the Taliban.

FRONTLINE reports from the lawless Pakistani tribal areas along the Afghanistan-Pakistan border and reveals how the area has fallen under the control of a resurgent Taliban militia. Despite the presence of 80,000 Pakistani troops, the Taliban and their supporters continue to use the region as a launching pad for attacks on U.S. and coalition forces in Afghanistan. In a region little understood because it is closed to most observers, FRONTLINE investigates a secret front in the war on terror.