 Dulmatin had received training in al-Qaeda camps in Afghanistan.He was believed to have been the protégé of Azahari Husin and under Azahari's guidance Dulmatin became an electronics specialist and bomb making expert.He participated in the car bomb attack on the Philippine ambassador in Jakarta on 1 August 2000 and assembled the timers for the 38 Christmas 2000 church bombings in Indonesia which killed 19 people.