The main cause comes under a deed of agreement which U.S Government made by the Pakistani Government.This agreement states that
(1)- Stop all Al-qaida Operations at your borders,Block armed shipment through Pakistan and end all logistical support for Bin Laden.
(2)- Provide the united states with blanket overflight and landing rights to conduct all necessary intelligence operations.
(3)- provide territorial acess to U.S and Intelligence as needed and other personel to conduct all necessary operations.
(4)- provide the U.S immediately intelligence ,immigration information and database about internal security .
(5)- pakistan government should condemn publically all terrorist attack.
(6)- pakistan should break diplomatic relationship with Talibans.
some of these demands were accepted as it is and rest were in some deformed form.