Some Pakistanis fought for the Taliban. Pakistani extremist groups provided infrastructural support to Al Qaeda. There was a coming and going of Al Qaeda militants and leaders between Afghanistan and Pakistan for several years. All that has really happened is that Al Qaeda has escaped from Afghanistan come into Pakistan, got in touch with their contacts and friends in these extremist groups, which then provided them with safe houses, cars, and not just in the border areas but also in the cities. Rooting out Al Qaeda in Pakistan now is where the main battle is being fought.