 One member of the group was an IDF expert in explosives who had access to sufficient ammunition and material stolen from the Israeli army to carry out the plan.Early in the morning of 27 April 1984, following a plan devised by Livni, three operatives went into East Jerusalem and fixed five powerful explosive devices to the bottoms of five Arab buses.The bombs were timed to explode that afternoon, during Friday, one of the busiest days of the week, when the buses would have been packed with Palestinian worshippers returned home from celebrating Isra and Mi'raj.