He received extensive bomb training in Afghanistan. He authored the JI bomb manual, used in the Philippine consulate bombing in Jakarta, Jakarta Stock Exchange bombing, the Christmas Eve bombing, the Bali bombing, and the 2003 Marriott Hotel bombing. He also planned the 2004 Jakarta embassy bombing and was implicated in the 2002 Makassar bombing, the 2004 Poso bus bombing, the 2005 Tentena market bombings and the 2005 Bali bombings. Prior to his death, he was one of the most wanted men in Indonesia along with Noordin Mohammad Top.