 Its Baghdad offices are based in a house that previously belonged to Ba'athist Deputy Prime Minister Tariq Aziz.Its leader, Ayatollah al-Hakim, was killed in a car bomb attack in the Iraqi city of Najaf on August 29, 2003.The car bomb exploded as the ayatollah was leaving a religious shrine (Imam Ali Mosque) in the city, just after Friday prayers, killing more than 85.