Security forces scramble to meet the new threat.
By Jason Burke in Islamabad and Harinder Baweja H ead west out of Amritsar and keep going. The drive may not be very comfortable but at least finding the route is straightforward. Go on up to Peshawar, the bustling and violent Pakistani frontier town, through the Khyber Pass, across the border into Afghanistan and then, keeping the Kabul river on your right, drive for another three hours. After a 100 more miles and a dozen checkposts you'll be threading a way through the bazaars of Jalalabad. Turn left at the main intersection and aim for the dusty hills on the southern horizon.