An audio-cassette purportedly carrying Bringing a recorded voice message from Osama bin Laden stated Statement that the Bali bombings Attack were in direct retaliation Revenge for support Supporting of the United States ' War on Terror and Australia 's role in the liberation of East Timor .

Osama bin Laden , the founder and first leader of the Islamist terrorist Terrorism group , Al-Qaeda , was killed Killing in Pakistan on May 2 , 2011 , shortly after 1:00 am PKT ( 20:00 UTC , May 1 ) by United States Navy SEALs of the U.S .