The video concluded with the captors demanding the release of all Muslim prisoners in Guantanamo Bay . They warned that , if their demands were not met , they would repeat such a beheading " again and again . " Three suspects were caught by February 6 , 2002 , after the IP address of those who sent the ransom e-mail was traced by police in Karachi . The arrests were carried out after investigation by Pakistani detective Mir Zubair Mahmood , assisted by an FBI computer expert . The mastermind of the kidnapping , Ahmed Omar Saeed Sheikh , surrendered to a former ISI officer , Brig. Ijaz Shah , who concealed Sheikh 's whereabouts from the Karachi police for a week . Sheikh had been in an Indian prison in connection with 1994 Kidnappings of Western tourists in India . In December 1999 he was released by the Indian government in exchange for the safe release of passengers aboard hijacked Indian Airlines Flight 814
Indian Airlines Flight 814
Indian Airlines Flight 814
Daniel Pearl