''The bastards first used us and are now playing dirty games with us,'' Khan writes about the Pakistani leadership in a December 2003 letter to his wife Henny that has finally been made public by an interlocutor. ''Darling, if the government plays any mischief with me take a tough stand,'' he tells his wife, adding, ''They might try to get rid of me to cover up all the things they got done by me.''

Pakistan's military intelligence agency, the Inter-Services Intelligence (ISI), has long faced accusations of meddling in the affairs of its neighbors. A range of officials inside and outside Pakistan have stepped up suggestions of links between the ISI and terrorist groups in recent years. In autumn 2006, a leaked report by a British Defense Ministry think tank charged, "Indirectly Pakistan (through the ISI) has been supporting terrorism and extremism-whether in London on 7/7 [the July 2005 attacks on London's transit system], or in Afghanistan, or Iraq." In June 2008, Afghan officials accused Pakistan's intelligence service of plotting a failed assassination attempt on President Hamid Karzai; shortly thereafter, they implied the ISI's involvement in a July 2008 attack on the Indian embassy. Indian officials also blamed the ISI for the bombing of the Indian embassy. Pakistani officials have denied such a connection. Numerous U.S. officials have also accused the ISI of supporting terrorist groups, even as the Pakistani government seeks increased aid from Washington with assurances of fighting militants.