Long designated a terrorist organization, Gamaa Islamiyya's spiritual head is Sheikh Omar Abdel Rahman
Egyptian demonstrators hold pictures of Sheikh Omar Abdel Rahman, jailed for life for the 1993 New York World Trade Centre bombing, during a protest near the US embassy in Cairo in 2011. Washington is investigating how a member of a radical Egyptian Islamist group listed as a terrorist organization, of which Sheikh Omar Abdel Rahman is the spiritual head, met with senior US officials.